possible deadlock in lookup_slow
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syzbot
Apr 15, 2019, 4:47:08 PM4/15/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 4d552acf Linux 4.19.34
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14cb89d3200000
kernel config: https://syzkaller.appspot.com/x/.config?x=c95a88291f095edd
dashboard link: https://syzkaller.appspot.com/bug?extid=14f0c20f85e5c0b26cf2
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+14f0c2...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.19.34 #2 Not tainted
overlayfs: failed to resolve './file1': -2
------------------------------------------------------
syz-executor.3/23163 is trying to acquire lock:
0000000001dd954f (&ovl_i_mutex_dir_key[depth]#2){++++}, at:
inode_lock_shared include/linux/fs.h:748 [inline]
0000000001dd954f (&ovl_i_mutex_dir_key[depth]#2){++++}, at:
lookup_slow+0x4a/0x80 fs/namei.c:1687
but task is already holding lock:
00000000226cc8dd (&sig->cred_guard_mutex){+.+.}, at:
prepare_bprm_creds+0x55/0x120 fs/exec.c:1404
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&sig->cred_guard_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102
do_io_accounting+0x1f4/0x830 fs/proc/base.c:2699
proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2748
proc_single_show+0xf6/0x180 fs/proc/base.c:737
traverse fs/seq_file.c:113 [inline]
traverse+0x1d6/0x760 fs/seq_file.c:91
seq_read+0x8f8/0x1130 fs/seq_file.c:188
do_loop_readv_writev fs/read_write.c:700 [inline]
do_loop_readv_writev fs/read_write.c:687 [inline]
do_iter_read+0x495/0x650 fs/read_write.c:924
vfs_readv+0xf0/0x160 fs/read_write.c:986
do_preadv+0x1c4/0x280 fs/read_write.c:1070
__do_sys_preadv fs/read_write.c:1120 [inline]
__se_sys_preadv fs/read_write.c:1115 [inline]
__x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1115
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&p->lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
seq_read+0x71/0x1130 fs/seq_file.c:161
proc_reg_read+0x1fa/0x2c0 fs/proc/inode.c:231
do_loop_readv_writev fs/read_write.c:700 [inline]
do_loop_readv_writev fs/read_write.c:687 [inline]
do_iter_read+0x495/0x650 fs/read_write.c:924
vfs_readv+0xf0/0x160 fs/read_write.c:986
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x478/0x890 fs/splice.c:417
do_splice_to+0x12a/0x190 fs/splice.c:881
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
splice_direct_to_actor+0x256/0x890 fs/splice.c:953
do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
do_sendfile+0x597/0xce0 fs/read_write.c:1446
__do_sys_sendfile64 fs/read_write.c:1507 [inline]
__se_sys_sendfile64 fs/read_write.c:1493 [inline]
__x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1493
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (sb_writers#6){.+.+}:
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+0x20b/0x360 fs/super.c:1387
sb_start_write include/linux/fs.h:1569 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:360
ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24
ovl_xattr_set+0x53/0x5b0 fs/overlayfs/inode.c:332
ovl_other_xattr_set+0x39/0x50 fs/overlayfs/super.c:946
__vfs_setxattr+0x121/0x190 fs/xattr.c:149
__vfs_setxattr_noperm+0x11c/0x410 fs/xattr.c:180
vfs_setxattr+0xda/0x100 fs/xattr.c:223
setxattr+0x26f/0x380 fs/xattr.c:450
path_setxattr+0x197/0x1b0 fs/xattr.c:469
__do_sys_setxattr fs/xattr.c:484 [inline]
__se_sys_setxattr fs/xattr.c:480 [inline]
__x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&ovl_i_mutex_dir_key[depth]#2){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:748 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1687
walk_component+0x74b/0x2000 fs/namei.c:1810
link_path_walk.part.0+0x980/0x1340 fs/namei.c:2141
link_path_walk fs/namei.c:2072 [inline]
path_openat+0x1f9/0x4690 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3564
do_open_execat+0x140/0x660 fs/exec.c:853
__do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755
do_execveat_common fs/exec.c:1866 [inline]
do_execve fs/exec.c:1883 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&ovl_i_mutex_dir_key[depth]#2 --> &p->lock --> &sig->cred_guard_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sig->cred_guard_mutex);
lock(&p->lock);
lock(&sig->cred_guard_mutex);
lock(&ovl_i_mutex_dir_key[depth]#2);
*** DEADLOCK ***
1 lock held by syz-executor.3/23163:
#0: 00000000226cc8dd (&sig->cred_guard_mutex){+.+.}, at:
prepare_bprm_creds+0x55/0x120 fs/exec.c:1404
stack backtrace:
CPU: 0 PID: 23163 Comm: syz-executor.3 Not tainted 4.19.34 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1861 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:748 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1687
walk_component+0x74b/0x2000 fs/namei.c:1810
link_path_walk.part.0+0x980/0x1340 fs/namei.c:2141
link_path_walk fs/namei.c:2072 [inline]
path_openat+0x1f9/0x4690 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3564
do_open_execat+0x140/0x660 fs/exec.c:853
__do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755
do_execveat_common fs/exec.c:1866 [inline]
do_execve fs/exec.c:1883 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd8d582cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000020000640 RSI: 00000000200005c0 RDI: 0000000020000080
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd8d582d6d4
R13: 00000000004bf216 R14: 00000000004d0458 R15: 00000000ffffffff
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "lowerdir" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "lowerdir" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "u " or missing value
overlayfs: unrecognized mount option "u " or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "upperdir��/file0" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "upperdir��/file0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './fi': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
overlayfs: unrecognized mount
option "yt�ҟ�-^��0 �;g_�y �R r��Ho � �# |�S �9rV�^cn����>����V�� tv�� Pº��ͫ�1t��g~�2 u��-����@)v饘"h� �2�� ��7 ���� 6�Nj<1�7oߜ[� �"
or missing value
overlayfs: failed to resolve './fi': -2
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount
option "yt�ҟ�-^��0 �;g_�y �R r��Ho � �# |�S �9rV�^cn����>����V�� tv�� Pº��ͫ�1t��g~�2 u��-����@)v饘"h� �2�� ��7 ���� 6�Nj<1�7oߜ[� �"
or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './fi': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file': -2
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file1C :m� �f ��[j�� /�i��u�� �w��tRe': -2
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: failed to resolve './file': -2
overlayfs: failed to resolve './file1C :m� �f ��[j�� /�i��u�� �w��tRe': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "Q� z֤�" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount option "Q� z֤�" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './file1����L�4 �po�^���g� ': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './file1����L�4 �po�^���g� ': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option " " or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "lower0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "tpperdi �� file0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "lowekdir=./file1" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "tp�perQir=e0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount option "upperd" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to
resolve './file1{ E hI�� >�{���d�`@ �rT� vP?�4�j�Kq�y���}��k�*Ŋ[K
� ': -2
overlayfs: failed to
resolve './file1{ E hI�� >�{���d�`@ �rT� vP?�4�j�Kq�y���}��k�*Ŋ[K
� ': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: missing 'lowerdir'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: missing 'lowerdir'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "uppermir=./file0�" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "wrkdir=./file1" or missing value
overlayfs: unrecognized mount option "wrkdir=./file1" or missing value
overlayfs: failed to resolve './file1': -2
overlayfs: unrecognized mount option "
��Lrdir=lowerdjr=.:file0" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
---
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 found the following crash on:
HEAD commit: 4d552acf Linux 4.19.34
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14cb89d3200000
kernel config: https://syzkaller.appspot.com/x/.config?x=c95a88291f095edd
dashboard link: https://syzkaller.appspot.com/bug?extid=14f0c20f85e5c0b26cf2
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+14f0c2...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.19.34 #2 Not tainted
overlayfs: failed to resolve './file1': -2
------------------------------------------------------
syz-executor.3/23163 is trying to acquire lock:
0000000001dd954f (&ovl_i_mutex_dir_key[depth]#2){++++}, at:
inode_lock_shared include/linux/fs.h:748 [inline]
0000000001dd954f (&ovl_i_mutex_dir_key[depth]#2){++++}, at:
lookup_slow+0x4a/0x80 fs/namei.c:1687
but task is already holding lock:
00000000226cc8dd (&sig->cred_guard_mutex){+.+.}, at:
prepare_bprm_creds+0x55/0x120 fs/exec.c:1404
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&sig->cred_guard_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102
do_io_accounting+0x1f4/0x830 fs/proc/base.c:2699
proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2748
proc_single_show+0xf6/0x180 fs/proc/base.c:737
traverse fs/seq_file.c:113 [inline]
traverse+0x1d6/0x760 fs/seq_file.c:91
seq_read+0x8f8/0x1130 fs/seq_file.c:188
do_loop_readv_writev fs/read_write.c:700 [inline]
do_loop_readv_writev fs/read_write.c:687 [inline]
do_iter_read+0x495/0x650 fs/read_write.c:924
vfs_readv+0xf0/0x160 fs/read_write.c:986
do_preadv+0x1c4/0x280 fs/read_write.c:1070
__do_sys_preadv fs/read_write.c:1120 [inline]
__se_sys_preadv fs/read_write.c:1115 [inline]
__x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1115
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&p->lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
seq_read+0x71/0x1130 fs/seq_file.c:161
proc_reg_read+0x1fa/0x2c0 fs/proc/inode.c:231
do_loop_readv_writev fs/read_write.c:700 [inline]
do_loop_readv_writev fs/read_write.c:687 [inline]
do_iter_read+0x495/0x650 fs/read_write.c:924
vfs_readv+0xf0/0x160 fs/read_write.c:986
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x478/0x890 fs/splice.c:417
do_splice_to+0x12a/0x190 fs/splice.c:881
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
splice_direct_to_actor+0x256/0x890 fs/splice.c:953
do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
do_sendfile+0x597/0xce0 fs/read_write.c:1446
__do_sys_sendfile64 fs/read_write.c:1507 [inline]
__se_sys_sendfile64 fs/read_write.c:1493 [inline]
__x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1493
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (sb_writers#6){.+.+}:
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+0x20b/0x360 fs/super.c:1387
sb_start_write include/linux/fs.h:1569 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:360
ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24
ovl_xattr_set+0x53/0x5b0 fs/overlayfs/inode.c:332
ovl_other_xattr_set+0x39/0x50 fs/overlayfs/super.c:946
__vfs_setxattr+0x121/0x190 fs/xattr.c:149
__vfs_setxattr_noperm+0x11c/0x410 fs/xattr.c:180
vfs_setxattr+0xda/0x100 fs/xattr.c:223
setxattr+0x26f/0x380 fs/xattr.c:450
path_setxattr+0x197/0x1b0 fs/xattr.c:469
__do_sys_setxattr fs/xattr.c:484 [inline]
__se_sys_setxattr fs/xattr.c:480 [inline]
__x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&ovl_i_mutex_dir_key[depth]#2){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:748 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1687
walk_component+0x74b/0x2000 fs/namei.c:1810
link_path_walk.part.0+0x980/0x1340 fs/namei.c:2141
link_path_walk fs/namei.c:2072 [inline]
path_openat+0x1f9/0x4690 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3564
do_open_execat+0x140/0x660 fs/exec.c:853
__do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755
do_execveat_common fs/exec.c:1866 [inline]
do_execve fs/exec.c:1883 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&ovl_i_mutex_dir_key[depth]#2 --> &p->lock --> &sig->cred_guard_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sig->cred_guard_mutex);
lock(&p->lock);
lock(&sig->cred_guard_mutex);
lock(&ovl_i_mutex_dir_key[depth]#2);
*** DEADLOCK ***
1 lock held by syz-executor.3/23163:
#0: 00000000226cc8dd (&sig->cred_guard_mutex){+.+.}, at:
prepare_bprm_creds+0x55/0x120 fs/exec.c:1404
stack backtrace:
CPU: 0 PID: 23163 Comm: syz-executor.3 Not tainted 4.19.34 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1861 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:748 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1687
walk_component+0x74b/0x2000 fs/namei.c:1810
link_path_walk.part.0+0x980/0x1340 fs/namei.c:2141
link_path_walk fs/namei.c:2072 [inline]
path_openat+0x1f9/0x4690 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3564
do_open_execat+0x140/0x660 fs/exec.c:853
__do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755
do_execveat_common fs/exec.c:1866 [inline]
do_execve fs/exec.c:1883 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd8d582cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000020000640 RSI: 00000000200005c0 RDI: 0000000020000080
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd8d582d6d4
R13: 00000000004bf216 R14: 00000000004d0458 R15: 00000000ffffffff
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "lowerdir" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "lowerdir" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "wor" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "u " or missing value
overlayfs: unrecognized mount option "u " or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "upperdir��/file0" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "upperdir��/file0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: workdir and upperdir must be separate subtrees
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './fi': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
overlayfs: unrecognized mount
option "yt�ҟ�-^��0 �;g_�y �R r��Ho � �# |�S �9rV�^cn����>����V�� tv�� Pº��ͫ�1t��g~�2 u��-����@)v饘"h� �2�� ��7 ���� 6�Nj<1�7oߜ[� �"
or missing value
overlayfs: failed to resolve './fi': -2
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount
option "yt�ҟ�-^��0 �;g_�y �R r��Ho � �# |�S �9rV�^cn����>����V�� tv�� Pº��ͫ�1t��g~�2 u��-����@)v饘"h� �2�� ��7 ���� 6�Nj<1�7oߜ[� �"
or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './fi': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file': -2
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to resolve './file1C :m� �f ��[j�� /�i��u�� �w��tRe': -2
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: failed to resolve './file': -2
overlayfs: failed to resolve './file1C :m� �f ��[j�� /�i��u�� �w��tRe': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "Q� z֤�" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount option "Q� z֤�" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './file1����L�4 �po�^���g� ': -2
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: failed to resolve './file1����L�4 �po�^���g� ': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option " " or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "lower0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: filesystem on './file0' not supported as upperdir
overlayfs: unrecognized mount option "tpperdi �� file0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "lowekdir=./file1" or missing value
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "tp�perQir=e0" or missing value
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: unrecognized mount option "upperd" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: failed to
resolve './file1{ E hI�� >�{���d�`@ �rT� vP?�4�j�Kq�y���}��k�*Ŋ[K
� ': -2
overlayfs: failed to
resolve './file1{ E hI�� >�{���d�`@ �rT� vP?�4�j�Kq�y���}��k�*Ŋ[K
� ': -2
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
overlayfs: missing 'lowerdir'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: missing 'lowerdir'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: filesystem on './file0' not supported as upperdir
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (000000003790a8c7): kobject_uevent_env
kobject: 'loop2' (000000003790a8c7): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (00000000e511d46e): kobject_uevent_env
kobject: 'loop0' (00000000e511d46e): fill_kobj_path: path
= '/devices/virtual/block/loop0'
overlayfs: unrecognized mount option "uppermir=./file0�" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
overlayfs: unrecognized mount option "wrkdir=./file1" or missing value
overlayfs: unrecognized mount option "wrkdir=./file1" or missing value
overlayfs: failed to resolve './file1': -2
overlayfs: unrecognized mount option "
��Lrdir=lowerdjr=.:file0" or missing value
kobject: 'loop1' (000000005c4b5494): kobject_uevent_env
kobject: 'loop1' (000000005c4b5494): fill_kobj_path: path
= '/devices/virtual/block/loop1'
---
This bug is generated by a bot. It may contain errors.
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syzbot
Oct 12, 2020, 6:59:17 PM10/12/20
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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