possible deadlock in lookup_slow

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syzbot

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Aug 23, 2019, 9:53:08 PM8/23/19

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Hello,

syzbot found the following crash on:

HEAD commit: 45f092f9 Linux 4.14.139
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11fc435a600000
kernel config: https://syzkaller.appspot.com/x/.config?x=56ab4cf14cc8892d
dashboard link: https://syzkaller.appspot.com/bug?extid=d4aadf131cacaa8fff34
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d4aadf...@syzkaller.appspotmail.com

overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: unrecognized mount option "lowerdir=" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
======================================================
WARNING: possible circular locking dependency detected
4.14.139 #35 Not tainted
------------------------------------------------------
syz-executor.2/28668 is trying to acquire lock:
(&ovl_i_mutex_dir_key[depth]#3){++++}, at: [<ffffffff818fbbb8>]
inode_lock_shared include/linux/fs.h:728 [inline]
(&ovl_i_mutex_dir_key[depth]#3){++++}, at: [<ffffffff818fbbb8>]
lookup_slow+0x138/0x440 fs/namei.c:1673

but task is already holding lock:
(&sig->cred_guard_mutex){+.+.}, at: [<ffffffff818eebe5>]
prepare_bprm_creds+0x55/0x120 fs/exec.c:1389

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #4 (&sig->cred_guard_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_interruptible_nested+0x16/0x20 kernel/locking/mutex.c:930
proc_pid_attr_write+0x163/0x290 fs/proc/base.c:2585
__vfs_write+0x105/0x6b0 fs/read_write.c:480
__kernel_write+0xfc/0x370 fs/read_write.c:501
write_pipe_buf+0x148/0x1c0 fs/splice.c:797
splice_from_pipe_feed fs/splice.c:502 [inline]
__splice_from_pipe+0x348/0x780 fs/splice.c:626
splice_from_pipe+0xf0/0x150 fs/splice.c:661
default_file_splice_write+0x3c/0x80 fs/splice.c:809
do_splice_from fs/splice.c:851 [inline]
do_splice fs/splice.c:1147 [inline]
SYSC_splice fs/splice.c:1402 [inline]
SyS_splice+0xd92/0x1430 fs/splice.c:1382
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #3 (&pipe->mutex/1){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
pipe_lock_nested fs/pipe.c:67 [inline]
pipe_lock+0x63/0x80 fs/pipe.c:75
iter_file_splice_write+0x15e/0xad0 fs/splice.c:699
do_splice_from fs/splice.c:851 [inline]
do_splice fs/splice.c:1147 [inline]
SYSC_splice fs/splice.c:1402 [inline]
SyS_splice+0xd92/0x1430 fs/splice.c:1382
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #2 (sb_writers#4){.+.+}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36
[inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x1ae/0x2f0 fs/super.c:1363
sb_start_write include/linux/fs.h:1548 [inline]
mnt_want_write+0x3f/0xb0 fs/namespace.c:386
ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:25
ovl_xattr_set+0x4f/0x270 fs/overlayfs/inode.c:214
ovl_other_xattr_set+0x39/0x50 fs/overlayfs/super.c:800
__vfs_setxattr+0xd8/0x130 fs/xattr.c:150
__vfs_setxattr_noperm+0x102/0x3c0 fs/xattr.c:181
vfs_setxattr+0xc5/0xf0 fs/xattr.c:224
setxattr+0x1de/0x350 fs/xattr.c:453
path_setxattr+0x11f/0x140 fs/xattr.c:472
SYSC_lsetxattr fs/xattr.c:494 [inline]
SyS_lsetxattr+0x38/0x50 fs/xattr.c:490
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
down_write_killable+0x3b/0xc0 kernel/locking/rwsem.c:68
iterate_dir+0x390/0x5f0 fs/readdir.c:43
ovl_dir_read fs/overlayfs/readdir.c:306 [inline]
ovl_dir_read_merged+0x153/0x440 fs/overlayfs/readdir.c:355
ovl_cache_get fs/overlayfs/readdir.c:407 [inline]
ovl_iterate+0x628/0xad0 fs/overlayfs/readdir.c:704
iterate_dir+0x47f/0x5f0 fs/readdir.c:54
SYSC_getdents64 fs/readdir.c:315 [inline]
SyS_getdents64+0x130/0x240 fs/readdir.c:296
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (&ovl_i_mutex_dir_key[depth]#3){++++}:
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:728 [inline]
lookup_slow+0x138/0x440 fs/namei.c:1673
walk_component+0x698/0x1d00 fs/namei.c:1824
link_path_walk+0x81f/0x10a0 fs/namei.c:2153
path_openat+0x189/0x3f70 fs/namei.c:3565
do_filp_open+0x18e/0x250 fs/namei.c:3600
do_open_execat+0xe7/0x4a0 fs/exec.c:849
do_execveat_common.isra.0+0x6d2/0x1dd0 fs/exec.c:1740
do_execveat fs/exec.c:1858 [inline]
SYSC_execveat fs/exec.c:1939 [inline]
SyS_execveat+0x4f/0x60 fs/exec.c:1931
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

other info that might help us debug this:

Chain exists of:
&ovl_i_mutex_dir_key[depth]#3 --> &pipe->mutex/1 -->
&sig->cred_guard_mutex

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&sig->cred_guard_mutex);
lock(&pipe->mutex/1);
lock(&sig->cred_guard_mutex);
lock(&ovl_i_mutex_dir_key[depth]#3);

*** DEADLOCK ***

1 lock held by syz-executor.2/28668:
#0: (&sig->cred_guard_mutex){+.+.}, at: [<ffffffff818eebe5>]
prepare_bprm_creds+0x55/0x120 fs/exec.c:1389

stack backtrace:
CPU: 1 PID: 28668 Comm: syz-executor.2 Not tainted 4.14.139 #35
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3991
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:728 [inline]
lookup_slow+0x138/0x440 fs/namei.c:1673
walk_component+0x698/0x1d00 fs/namei.c:1824
link_path_walk+0x81f/0x10a0 fs/namei.c:2153
path_openat+0x189/0x3f70 fs/namei.c:3565
do_filp_open+0x18e/0x250 fs/namei.c:3600
do_open_execat+0xe7/0x4a0 fs/exec.c:849
do_execveat_common.isra.0+0x6d2/0x1dd0 fs/exec.c:1740
do_execveat fs/exec.c:1858 [inline]
SYSC_execveat fs/exec.c:1939 [inline]
SyS_execveat+0x4f/0x60 fs/exec.c:1931
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459879
RSP: 002b:00007f483c736c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459879
RDX: 0000000020000440 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000020000580 R11: 0000000000000246 R12: 00007f483c7376d4
R13: 00000000004bff90 R14: 00000000004d1f48 R15: 00000000ffffffff
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: maximum fs stacking depth exceeded
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: missing 'lowerdir'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: unrecognized mount option "Z�`]" or missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: unrecognized mount option "��y 8ueperlowerdir=./file1" or
missing value
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "��y 8ueperlowerdir=./file1" or
missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: unrecognized mount option " 4perdir=./fine0" or missing value
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: unrecognized mount option " 4perdir=./fine0" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: unrecognized mount option "lo" or missing value
overlayfs: missing 'workdir'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: unrecognized mount option "01777777777777777777777" or missing
value
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "lo" or missing value
overlayfs: missing 'workdir'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: unrecognized mount option "01777777777777777777777" or missing
value
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: missing 'workdir'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: missing 'workdir'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
overlayfs: unrecognized mount option "upperdir�ؑ 70t �P�R�=" or missing
value
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "upperdir�ؑ 70t �P�R�=" or missing
value
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "lowezdir=./file1" or missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: unrecognized mount option "lowezdir=./file1" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
overlayfs: missing 'lowerdir'
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: missing 'lowerdir'
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: failed to resolve './file1': -2
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "uppime0" or missing value
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
overlayfs: unrecognized mount option "uppime0" or missing value
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: failed to resolve './fi�e1': -2
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: failed to resolve './fi�e1': -2
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: maximum fs stacking depth exceeded
kobject: '0:58' (ffff88807d062a50): kobject_add_internal: parent: 'bdi',
set: 'devices'
overlayfs: missing 'lowerdir'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: '0:58' (ffff88807d062a50): kobject_uevent_env
overlayfs: missing 'lowerdir'
kobject: '0:58' (ffff88807d062a50): fill_kobj_path: path
= '/devices/virtual/bdi/0:58'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "L " or missing value
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: failed to resolve './file1': -2
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve './file1m�� J�́� ��Ė6R�� S� ��Z�'��':
-2
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
overlayfs: failed to resolve './file1m�� J�́� ��Ė6R�� S� ��Z�'��':
-2
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: statfs failed on './file0'
kobject: '0:54' (ffff8880548761d0): kobject_add_internal: parent: 'bdi',
set: 'devices'
kobject: '0:54' (ffff8880548761d0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: '0:54' (ffff8880548761d0): fill_kobj_path: path
= '/devices/virtual/bdi/0:54'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: unrecognized mount option "L " or missing value
overlayfs: statfs failed on './file0'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: unrecognized mount option "u" or missing value
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "u" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: '0:54' (ffff8880548761d0): kobject_uevent_env
kobject: '0:54' (ffff8880548761d0): fill_kobj_path: path
= '/devices/virtual/bdi/0:54'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: '0:54' (ffff8880548761d0): kobject_cleanup, parent (null)
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: '0:54' (ffff8880548761d0): calling ktype release
overlayfs: maximum fs stacking depth exceeded
kobject: '0:54': free name
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: '0:58' (ffff88807d062a50): kobject_uevent_env
kobject: '0:58' (ffff88807d062a50): fill_kobj_path: path
= '/devices/virtual/bdi/0:58'
kobject: '0:58' (ffff88807d062a50): kobject_cleanup, parent (null)
kobject: '0:58' (ffff88807d062a50): calling ktype release
kobject: '0:58': free name
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "��xA��4 �e5u��#
�� P�# gh HK>
g�Y8;�� q��c�Ȃ��9��f*�" or missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "��xA��4 �e5u��#
�� P�# gh HK>
g�Y8;�� q��c�Ȃ��9��f*�" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: missing 'lowerdir'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: missing 'lowerdir'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: unrecognized mount
option "up�2&�?��R6��rK�perdir=./file0{�ierdir=./file1" or missing value
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount
option "up�2&�?��R6��rK�perdir=./file0{�ierdir=./file1" or missing value
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
overlayfs: missing 'lowerdir'
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: failed to resolve './file1': -2
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: missing 'lowerdir'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
overlayfs: unrecognized mount option "lowerdwor<kdirsO" or missing value
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: unrecognized mount
option "l��}ZK��{(owerdir=.:fil}��&!҄ȇ �Aw� >�� K1��\��~��. ��+�3�<� ]"
or missing value
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: unrecognized mount option "lowerdwor<kdirsO" or missing value
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
overlayfs: unrecognized mount
option "l��}ZK��{(owerdir=.:fil}��&!҄ȇ �Aw� >�� K1��\��~��. ��+�3�<� ]"
or missing value
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: unrecognized mount option "workd� " or missing value
overlayfs: unrecognized mount option "0xffffffffffffffff" or missing value
overlayfs: unrecognized mount
option "lowerdSr=.:file � �0 R��%�˰�� @�"'t{��w�$ WFK��µv?.S$� �g�G @��Xb��n� h�� Խv� B<�Y9 �OҀ�w��\��w�I|�җ�� ^'�|
*��
�_" or missing value
overlayfs: unrecognized mount option "workd� " or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: unrecognized mount option "uppe/file0" or missing value
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "work " or missing value
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: unrecognized mount option "work " or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
gfs2: commit mount option requires a positive numeric argument
gfs2: can't parse mount arguments
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve 'file0� g&�07j�l �6�': -2
overlayfs: failed to resolve 'file0� g&�07j�l �6�': -2
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: unrecognized mount option "_f ��upperdir=./file0" or missing
value
overlayfs: unrecognized mount option "_f ��upperdir=./file0" or missing
value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve './file1': -2
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve './file1': -2
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
audit: type=1804 audit(1566607968.834:153): pid=29164 uid=0 auid=4294967295
ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
op="invalid_pcr" cause="ToMToU" comm="syz-executor.3"
name="/root/syzkaller-testdir120842502/syzkaller.QF3ABE/324/bus" dev="sda1"
ino=16620 res=1
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve './file1': -2
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "0xffffffffffffffff" or missing value
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: failed to resolve './file1': -2
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: unrecognized mount option "upper��M��b��ؓ/~C�dir=./file0" or
missing value
overlayfs: unrecognized mount option "upper��M��b��ؓ/~C�dir=./file0" or
missing value
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option " S��" or missing value
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option " S��" or missing value
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: unrecognized mount option "upplowerdir=.Rfile1" or missing value
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount option "upplowerdir=.Rfile1" or missing value
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: missing 'workdir'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: unrecognized mount option "upir=./fidir=./filekdir=./file1" or
missing value
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: unrecognized mount option "upir=./fidir=./filekdir=./file1" or
missing value
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: unrecognized mount option "l=.:1��V" or missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "l=.:1��V" or missing value
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: unrecognized mount option "lowmrdir=.:file0" or missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: unrecognized mount option "lowmrdir=.:file0" or missing value
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: missing 'lowerdir'
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: missing 'lowerdir'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
overlayfs: maximum fs stacking depth exceeded
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff888219fc3610): kobject_uevent_env
kobject: 'kvm' (ffff888219fc3610): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: failed to resolve './file1': -2
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: failed to resolve './file1': -2
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: unrecognized mount option "fowner=00000000000000000000" or
missing value
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: fs on 'file0' does not support file handles, falling back to
index=off.
overlayfs: maximum fs stacking depth exceeded
kobject: 'loop3' (ffff8880a49df1a0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49df1a0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a4a380e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a380e0): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a49a77a0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49a77a0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: failed to resolve './file1': -2
kobject: 'loop5' (ffff8880a4a829e0): kobject_uevent_env
overlayfs: failed to resolve './file1': -2
kobject: 'loop5' (ffff8880a4a829e0): fill_kobj_path: path
= '/devices/virtual/block/loop5'
overlayfs: missing 'lowerdir'

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Sep 28, 2020, 5:45:22 AM9/28/20

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: cbfa1702 Linux 4.14.198
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12c9bee3900000
kernel config: https://syzkaller.appspot.com/x/.config?x=3990958d85b55e59
dashboard link: https://syzkaller.appspot.com/bug?extid=d4aadf131cacaa8fff34
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1608bd03900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4aadf...@syzkaller.appspotmail.com

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
======================================================
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

WARNING: possible circular locking dependency detected

4.14.198-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/8136 is trying to acquire lock:
(&ovl_i_mutex_dir_key[depth]){++++}, at: [<ffffffff818f5ef9>] inode_lock_shared include/linux/fs.h:729 [inline]
(&ovl_i_mutex_dir_key[depth]){++++}, at: [<ffffffff818f5ef9>] lookup_slow+0x129/0x400 fs/namei.c:1674

but task is already holding lock:

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
(&oi->lock){+.+.}, at: [<ffffffff8225b35f>] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #2 (&oi->lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318
ovl_copy_up_one+0x219/0x8d0 fs/overlayfs/copy_up.c:630
ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685
ovl_rename+0x1a6/0xe90 fs/overlayfs/dir.c:943
vfs_rename+0x560/0x1820 fs/namei.c:4496
SYSC_renameat2 fs/namei.c:4644 [inline]
SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #1 (sb_writers#3){.+.+}:

percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]

__sb_start_write+0x19a/0x2e0 fs/super.c:1363
sb_start_write include/linux/fs.h:1549 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:386
ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538
lookup_open+0x77a/0x1750 fs/namei.c:3241
do_last fs/namei.c:3334 [inline]
path_openat+0xe08/0x2970 fs/namei.c:3569
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081
overlayfs: './file0' not a directory
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:729 [inline]
lookup_slow+0x129/0x400 fs/namei.c:1674
lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595
ovl_lower_positive+0x184/0x345 fs/overlayfs/namei.c:783
ovl_rename+0x47c/0xe90 fs/overlayfs/dir.c:968
vfs_rename+0x560/0x1820 fs/namei.c:4496
SYSC_renameat2 fs/namei.c:4644 [inline]
SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

other info that might help us debug this:

Chain exists of:

&ovl_i_mutex_dir_key[depth] --> sb_writers#3 --> &oi->lock

Possible unsafe locking scenario:

CPU0 CPU1
---- ----

lock(&oi->lock);
lock(sb_writers#3);
lock(&oi->lock);
lock(&ovl_i_mutex_dir_key[depth]);

*** DEADLOCK ***

8 locks held by syz-executor.2/8136:
#0: (sb_writers#16){.+.+}, at: [<ffffffff81944b4a>] sb_start_write include/linux/fs.h:1549 [inline]
#0: (sb_writers#16){.+.+}, at: [<ffffffff81944b4a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
#1: (&type->s_vfs_rename_key#2){+.+.}, at: [<ffffffff818f6224>] lock_rename+0x54/0x280 fs/namei.c:2889
#2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818f6270>] inode_lock_nested include/linux/fs.h:754 [inline]
#2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818f6270>] lock_rename+0xa0/0x280 fs/namei.c:2893
#3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff818f62a4>] inode_lock_nested include/linux/fs.h:754 [inline]
#3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff818f62a4>] lock_rename+0xd4/0x280 fs/namei.c:2894
#4: (&ovl_i_mutex_key[depth]){+.+.}, at: [<ffffffff8192fa0a>] inode_lock include/linux/fs.h:719 [inline]
#4: (&ovl_i_mutex_key[depth]){+.+.}, at: [<ffffffff8192fa0a>] lock_two_nondirectories+0xca/0xf0 fs/inode.c:990
#5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [<ffffffff8192f9f2>] inode_lock_nested include/linux/fs.h:754 [inline]
#5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [<ffffffff8192f9f2>] lock_two_nondirectories+0xb2/0xf0 fs/inode.c:992
#6: (sb_writers#3){.+.+}, at: [<ffffffff81944b4a>] sb_start_write include/linux/fs.h:1549 [inline]
#6: (sb_writers#3){.+.+}, at: [<ffffffff81944b4a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
#7: (&oi->lock){+.+.}, at: [<ffffffff8225b35f>] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523

stack backtrace:
CPU: 0 PID: 8136 Comm: syz-executor.2 Not tainted 4.14.198-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]

dump_stack+0x1b2/0x283 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:729 [inline]
lookup_slow+0x129/0x400 fs/namei.c:1674
lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595
ovl_lower_positive+0x184/0x345 fs/overlayfs/namei.c:783
ovl_rename+0x47c/0xe90 fs/overlayfs/dir.c:968
vfs_rename+0x560/0x1820 fs/namei.c:4496
SYSC_renameat2 fs/namei.c:4644 [inline]
SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e179
RSP: 002b:00007f7f23e3ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000027280 RCX: 000000000045e179
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000020000380
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff50ecc11f R14: 00007f7f23e3b9c0 R15: 000000000118cf4c
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: failed to resolve 'file0': -2
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: failed to resolve 'file0': -2

overlayfs: maximum fs stacking depth exceeded

overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: failed to resolve 'file0': -2
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: failed to resolve 'file0': -2
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: failed to resolve 'file0': -2

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory
overlayfs: filesystem on './bus' not supported as upperdir

syzbot

unread,

Dec 8, 2020, 12:34:11 PM12/8/20

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: 47cbf4cc Linux 4.14.211
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13087137500000
kernel config: https://syzkaller.appspot.com/x/.config?x=fdd708417c3f7d5b
dashboard link: https://syzkaller.appspot.com/bug?extid=d4aadf131cacaa8fff34

compiler: gcc (GCC) 10.1.0-syz 20200507

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135a58c5500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11eecc13500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4aadf...@syzkaller.appspotmail.com

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve './file1': -2

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
======================================================
overlayfs: fs on '.' does not support file handles, falling back to index=off.

WARNING: possible circular locking dependency detected

4.14.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor292/7994 is trying to acquire lock:
(

overlayfs: maximum fs stacking depth exceeded

&ovl_i_mutex_dir_key[depth]){++++}, at: [<ffffffff818b2de9>] inode_lock_shared include/linux/fs.h:729 [inline]
&ovl_i_mutex_dir_key[depth]){++++}, at: [<ffffffff818b2de9>] lookup_slow+0x129/0x400 fs/namei.c:1674

but task is already holding lock:

overlayfs: filesystem on './bus' not supported as upperdir

(&oi->lock){+.+.}, at: [<ffffffff823617ef>] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #2 (&oi->lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318

ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:630
ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685
ovl_rename+0x1a6/0xf10 fs/overlayfs/dir.c:943

overlayfs: filesystem on './bus' not supported as upperdir

vfs_rename+0x560/0x1820 fs/namei.c:4496
SYSC_renameat2 fs/namei.c:4644 [inline]
SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #1 (sb_writers#3){.+.+}:

percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]

__sb_start_write+0x64/0x260 fs/super.c:1342

sb_start_write include/linux/fs.h:1549 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:386
ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538

overlayfs: fs on '.' does not support file handles, falling back to index=off.

lookup_open+0x77a/0x1750 fs/namei.c:3241
do_last fs/namei.c:3334 [inline]
path_openat+0xe08/0x2970 fs/namei.c:3569
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081

do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
down_read+0x36/0x80 kernel/locking/rwsem.c:24

overlayfs: fs on '.' does not support file handles, falling back to index=off.

inode_lock_shared include/linux/fs.h:729 [inline]
lookup_slow+0x129/0x400 fs/namei.c:1674
lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595
ovl_lower_positive+0x184/0x345 fs/overlayfs/namei.c:783

ovl_rename+0x47c/0xf10 fs/overlayfs/dir.c:968

overlayfs: 'file0' not a directory

other info that might help us debug this:

Chain exists of:

&ovl_i_mutex_dir_key[depth] --> sb_writers#3 --> &oi->lock

Possible unsafe locking scenario:

CPU0 CPU1
---- ----

lock(&oi->lock);
lock(sb_writers#3);
lock(&oi->lock);
lock(&ovl_i_mutex_dir_key[depth]);

*** DEADLOCK ***

8 locks held by syz-executor292/7994:
#0:

overlayfs: 'file0' not a directory

(sb_writers#10){.+.+}, at: [<ffffffff81901a3a>] sb_start_write include/linux/fs.h:1549 [inline]
(sb_writers#10){.+.+}, at: [<ffffffff81901a3a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
#1:

overlayfs: filesystem on './bus' not supported as upperdir

(&type->s_vfs_rename_key#2){+.+.}, at: [<ffffffff818b3114>] lock_rename+0x54/0x280 fs/namei.c:2889
#2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818b3160>] inode_lock_nested include/linux/fs.h:754 [inline]
#2: (&ovl_i_mutex_dir_key[depth]#2/1){+.+.}, at: [<ffffffff818b3160>] lock_rename+0xa0/0x280 fs/namei.c:2893
#3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff818b3194>] inode_lock_nested include/linux/fs.h:754 [inline]
#3: (&ovl_i_mutex_dir_key[depth]#2/2){+.+.}, at: [<ffffffff818b3194>] lock_rename+0xd4/0x280 fs/namei.c:2894
#4: (&ovl_i_mutex_key[depth]#2){+.+.}, at: [<ffffffff818ec8fa>] inode_lock include/linux/fs.h:719 [inline]
#4: (&ovl_i_mutex_key[depth]#2){+.+.}, at: [<ffffffff818ec8fa>] lock_two_nondirectories+0xca/0xf0 fs/inode.c:990
#5: (&ovl_i_mutex_key[depth]#2/4){+.+.}, at: [<ffffffff818ec8e2>] inode_lock_nested include/linux/fs.h:754 [inline]
#5: (&ovl_i_mutex_key[depth]#2/4){+.+.}, at: [<ffffffff818ec8e2>] lock_two_nondirectories+0xb2/0xf0 fs/inode.c:992
#6: (sb_writers#3){.+.+}, at: [<ffffffff81901a3a>] sb_start_write include/linux/fs.h:1549 [inline]
#6: (sb_writers#3){.+.+}, at: [<ffffffff81901a3a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
#7: (&oi->lock){+.+.}, at: [<ffffffff823617ef>] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523

stack backtrace:
CPU: 0 PID: 7994 Comm: syz-executor292 Not tainted 4.14.211-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]

ovl_rename+0x47c/0xf10 fs/overlayfs/dir.c:968

RIP: 0033:0x446f59
RSP: 002b:00007fe0f6e7bdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446f59
RDX: 0000000000446f59 RSI: 0000000020000440 RDI: 0000000020000380
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007ffeeb52986f R14: 00007fe0f6e7c9c0 R15: 0000000000000000
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: failed to resolve './file1': -2

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: failed to resolve './file1': -2

overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: failed to resolve 'file0': -2

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: failed to resolve 'file0': -2
overlayfs: failed to resolve 'file0': -2

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: './file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: failed to resolve 'file0': -2

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve './file1': -2

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: failed to resolve './file1': -2
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: './file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: failed to resolve './file1': -2
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: './file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: './file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: './file0' not a directory

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: './file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: failed to resolve 'file0': -2

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: failed to resolve 'file0': -2

overlayfs: './file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: maximum fs stacking depth exceeded
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: 'file0' not a directory

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: 'file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './file0' not a directory
overlayfs: failed to resolve 'file0': -2

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: failed to resolve 'file0': -2

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.

overlayfs: failed to resolve 'file0': -2

overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir

overlayfs: maximum fs stacking depth exceeded

overlayfs: 'file0' not a directory
overlayfs: 'file0' not a directory
overlayfs: './file0' not a directory

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on 'file0' does not support file handles, falling back to index=off.

overlayfs: fs on '.' does not support file handles, falling back to index=off.

overlayfs: maximum fs stacking depth exceeded

overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir