possible deadlock in lookup_one_len_unlocked (3)
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syzbot
Feb 6, 2022, 11:25:18 AM2/6/22
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12b9b2b4700000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=886e554102c9ec745718
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+886e55...@syzkaller.appspotmail.com
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
audit: type=1800 audit(1644164649.860:525): pid=24251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14673 res=0
======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/24220 is trying to acquire lock:
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline]
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
but task is already holding lock:
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline]
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&ovl_i_mutex_dir_key[depth]#2){++++}:
inode_lock_shared include/linux/fs.h:758 [inline]
do_last fs/namei.c:3326 [inline]
path_openat+0x17ec/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #3 (&sig->cred_guard_mutex){+.+.}:
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
proc_single_show+0xeb/0x170 fs/proc/base.c:755
seq_read+0x4e0/0x11c0 fs/seq_file.c:232
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x457/0xa00 fs/splice.c:417
do_splice_to+0x10e/0x160 fs/splice.c:881
splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&p->lock){+.+.}:
seq_read+0x6b/0x11c0 fs/seq_file.c:164
proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x457/0xa00 fs/splice.c:417
do_splice_to+0x10e/0x160 fs/splice.c:881
splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (sb_writers#3){.+.+}:
sb_start_write include/linux/fs.h:1579 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:360
ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602
lookup_open+0x893/0x1a20 fs/namei.c:3235
do_last fs/namei.c:3327 [inline]
path_openat+0x1094/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:758 [inline]
lookup_slow fs/namei.c:1688 [inline]
lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206
ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292
ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903
lookup_open+0x698/0x1a20 fs/namei.c:3214
do_last fs/namei.c:3327 [inline]
path_openat+0x1804/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&ovl_i_mutex_dir_key[depth] --> &sig->cred_guard_mutex --> &ovl_i_mutex_dir_key[depth]#2
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ovl_i_mutex_dir_key[depth]#2);
lock(&sig->cred_guard_mutex);
lock(&ovl_i_mutex_dir_key[depth]#2);
lock(&ovl_i_mutex_dir_key[depth]);
*** DEADLOCK ***
2 locks held by syz-executor.3/24220:
#0: 00000000698363b6 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline]
#0: 00000000698363b6 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline]
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537
stack backtrace:
CPU: 0 PID: 24220 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2420 [inline]
__lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:758 [inline]
lookup_slow fs/namei.c:1688 [inline]
lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206
ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292
ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903
lookup_open+0x698/0x1a20 fs/namei.c:3214
do_last fs/namei.c:3327 [inline]
path_openat+0x1804/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 0000000020000840 RSI: 00000000200006c0 RDI: 00000000200003c0
RBP: 00007fea2d95108d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
xt_CT: You must specify a L4 protocol and not use inversions on it
xt_CT: You must specify a L4 protocol and not use inversions on it
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
nla_parse: 11 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
xt_ct_set_helper: 9 callbacks suppressed
xt_CT: You must specify a L4 protocol and not use inversions on it
xt_CT: You must specify a L4 protocol and not use inversions on it
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
audit: type=1800 audit(1644164654.580:526): pid=24634 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14579 res=0
audit: type=1800 audit(1644164654.850:527): pid=24691 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14369 res=0
audit: type=1800 audit(1644164655.010:528): pid=24728 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14337 res=0
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
xt_CT: You must specify a L4 protocol and not use inversions on it
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
overlayfs: './file0' not a directory
overlayfs: overlapping lowerdir path
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
overlayfs: overlapping lowerdir path
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 1 PID: 25279 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007fea2c26c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
CPU: 0 PID: 25308 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e24486059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e22dfb168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f5e24598f60 RCX: 00007f5e24486059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f5e22dfb1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff4af3699f R14: 00007f5e22dfb300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 25322 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
kmem_cache_alloc_trace+0x284/0x380 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
ppp_register_net_channel+0x4e/0x6d0 drivers/net/ppp/ppp_generic.c:2574
pppol2tp_connect+0x151e/0x1c30 net/l2tp/l2tp_ppp.c:826
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007fea2c26c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
CPU: 0 PID: 25321 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
kmem_cache_alloc_trace+0x284/0x380 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
ppp_register_net_channel+0x4e/0x6d0 drivers/net/ppp/ppp_generic.c:2574
pppol2tp_connect+0x151e/0x1c30 net/l2tp/l2tp_ppp.c:826
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e24486059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e22dfb168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f5e24598f60 RCX: 00007f5e24486059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f5e22dfb1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff4af3699f R14: 00007f5e22dfb300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 25468 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f02e6e21059
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12b9b2b4700000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=886e554102c9ec745718
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+886e55...@syzkaller.appspotmail.com
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
audit: type=1800 audit(1644164649.860:525): pid=24251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14673 res=0
======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/24220 is trying to acquire lock:
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline]
0000000006bd32f8 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
but task is already holding lock:
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline]
000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&ovl_i_mutex_dir_key[depth]#2){++++}:
inode_lock_shared include/linux/fs.h:758 [inline]
do_last fs/namei.c:3326 [inline]
path_openat+0x17ec/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #3 (&sig->cred_guard_mutex){+.+.}:
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
proc_single_show+0xeb/0x170 fs/proc/base.c:755
seq_read+0x4e0/0x11c0 fs/seq_file.c:232
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x457/0xa00 fs/splice.c:417
do_splice_to+0x10e/0x160 fs/splice.c:881
splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&p->lock){+.+.}:
seq_read+0x6b/0x11c0 fs/seq_file.c:164
proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x457/0xa00 fs/splice.c:417
do_splice_to+0x10e/0x160 fs/splice.c:881
splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (sb_writers#3){.+.+}:
sb_start_write include/linux/fs.h:1579 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:360
ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602
lookup_open+0x893/0x1a20 fs/namei.c:3235
do_last fs/namei.c:3327 [inline]
path_openat+0x1094/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:758 [inline]
lookup_slow fs/namei.c:1688 [inline]
lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206
ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292
ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903
lookup_open+0x698/0x1a20 fs/namei.c:3214
do_last fs/namei.c:3327 [inline]
path_openat+0x1804/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&ovl_i_mutex_dir_key[depth] --> &sig->cred_guard_mutex --> &ovl_i_mutex_dir_key[depth]#2
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ovl_i_mutex_dir_key[depth]#2);
lock(&sig->cred_guard_mutex);
lock(&ovl_i_mutex_dir_key[depth]#2);
lock(&ovl_i_mutex_dir_key[depth]);
*** DEADLOCK ***
2 locks held by syz-executor.3/24220:
#0: 00000000698363b6 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline]
#0: 00000000698363b6 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline]
#1: 000000000d20cfa8 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537
stack backtrace:
CPU: 0 PID: 24220 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2420 [inline]
__lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:758 [inline]
lookup_slow fs/namei.c:1688 [inline]
lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573
ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206
ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292
ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903
lookup_open+0x698/0x1a20 fs/namei.c:3214
do_last fs/namei.c:3327 [inline]
path_openat+0x1804/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 0000000020000840 RSI: 00000000200006c0 RDI: 00000000200003c0
RBP: 00007fea2d95108d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
xt_CT: You must specify a L4 protocol and not use inversions on it
xt_CT: You must specify a L4 protocol and not use inversions on it
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
nla_parse: 11 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.
xt_ct_set_helper: 9 callbacks suppressed
xt_CT: You must specify a L4 protocol and not use inversions on it
xt_CT: You must specify a L4 protocol and not use inversions on it
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:1a) already exists on: team0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
audit: type=1800 audit(1644164654.580:526): pid=24634 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14579 res=0
audit: type=1800 audit(1644164654.850:527): pid=24691 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14369 res=0
audit: type=1800 audit(1644164655.010:528): pid=24728 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14337 res=0
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
xt_CT: You must specify a L4 protocol and not use inversions on it
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
EXT4-fs (loop5): mounting ext2 file system using the ext4 subsystem
EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor.5: iget: bad extended attribute block 3564958526
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
overlayfs: './file0' not a directory
overlayfs: overlapping lowerdir path
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
overlayfs: overlapping lowerdir path
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 1 PID: 25279 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007fea2c26c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
CPU: 0 PID: 25308 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e24486059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e22dfb168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f5e24598f60 RCX: 00007f5e24486059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f5e22dfb1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff4af3699f R14: 00007f5e22dfb300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 25322 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
kmem_cache_alloc_trace+0x284/0x380 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
ppp_register_net_channel+0x4e/0x6d0 drivers/net/ppp/ppp_generic.c:2574
pppol2tp_connect+0x151e/0x1c30 net/l2tp/l2tp_ppp.c:826
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fea2d8f7059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea2c26c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fea2da09f60 RCX: 00007fea2d8f7059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007fea2c26c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff5d6063cf R14: 00007fea2c26c300 R15: 0000000000022000
CPU: 0 PID: 25321 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
kmem_cache_alloc_trace+0x284/0x380 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
ppp_register_net_channel+0x4e/0x6d0 drivers/net/ppp/ppp_generic.c:2574
pppol2tp_connect+0x151e/0x1c30 net/l2tp/l2tp_ppp.c:826
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5e24486059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e22dfb168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f5e24598f60 RCX: 00007f5e24486059
RDX: 000000000000003a RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f5e22dfb1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff4af3699f R14: 00007f5e22dfb300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 25468 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0xf lib/fault-inject.c:149
__should_failslab+0x115/0x180 mm/failslab.c:32
should_failslab+0x5/0x10 mm/slab_common.c:1590
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
__do_kmalloc mm/slab.c:3725 [inline]
__kmalloc+0x2ab/0x3c0 mm/slab.c:3736
kmalloc include/linux/slab.h:520 [inline]
kzalloc include/linux/slab.h:709 [inline]
l2tp_session_create+0x35/0xbb0 net/l2tp/l2tp_core.c:1654
pppol2tp_connect+0xff6/0x1c30 net/l2tp/l2tp_ppp.c:782
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f02e6e21059
---
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syzbot
Jan 19, 2023, 8:28:32 AM1/19/23
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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