======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc6-syzkaller-00007-g0b46b049d6ec #0 Not tainted
------------------------------------------------------
syz.4.3544/16863 is trying to acquire lock:
ffff888063695b38 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
but task is already holding lock:
ffff888024a08868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c:92 [inline]
ffff888024a08868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock+0x64/0x80 fs/pipe.c:89
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&pipe->mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
pipe_lock fs/pipe.c:92 [inline]
pipe_lock+0x64/0x80 fs/pipe.c:89
iter_file_splice_write+0x1eb/0x10b0 fs/splice.c:687
do_splice_from fs/splice.c:941 [inline]
do_splice+0x146a/0x1f70 fs/splice.c:1354
__do_splice+0x327/0x360 fs/splice.c:1436
__do_sys_splice fs/splice.c:1639 [inline]
__se_sys_splice fs/splice.c:1621 [inline]
__x64_sys_splice+0x187/0x250 fs/splice.c:1621
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (sb_writers#6){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1785 [inline]
sb_start_write include/linux/fs.h:1921 [inline]
mnt_want_write+0x6f/0x450 fs/namespace.c:547
ovl_set_or_remove_acl fs/overlayfs/inode.c:517 [inline]
ovl_set_acl+0x637/0x9f0 fs/overlayfs/inode.c:566
set_posix_acl+0x25c/0x320 fs/posix_acl.c:954
vfs_set_acl+0x5a7/0x930 fs/posix_acl.c:1133
do_set_acl+0xd9/0x1a0 fs/posix_acl.c:1278
do_setxattr+0xe7/0x170 fs/xattr.c:633
filename_setxattr+0x16d/0x1d0 fs/xattr.c:665
path_setxattrat+0x1e0/0x290 fs/xattr.c:713
__do_sys_setxattr fs/xattr.c:747 [inline]
__se_sys_setxattr fs/xattr.c:743 [inline]
__x64_sys_setxattr+0xc6/0x140 fs/xattr.c:743
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1524
inode_lock_shared include/linux/fs.h:887 [inline]
lookup_slow fs/namei.c:1809 [inline]
walk_component+0x342/0x5b0 fs/namei.c:2114
lookup_last fs/namei.c:2612 [inline]
path_lookupat+0x17f/0x770 fs/namei.c:2636
filename_lookup+0x221/0x5f0 fs/namei.c:2665
kern_path+0x35/0x50 fs/namei.c:2773
lookup_bdev+0xd9/0x280 block/bdev.c:1163
resume_store+0x1d8/0x460 kernel/power/hibernate.c:1247
kobj_attr_store+0x55/0x80 lib/kobject.c:840
sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139
kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0x5ae/0x1150 fs/read_write.c:679
ksys_write+0x12b/0x250 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&of->mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
seq_read_iter+0x2ab/0x12b0 fs/seq_file.c:225
kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x886/0xbf0 fs/read_write.c:565
ksys_read+0x12b/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&p->lock){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
proc_reg_read_iter+0x21d/0x310 fs/proc/inode.c:299
copy_splice_read+0x61d/0xb80 fs/splice.c:365
do_splice_read fs/splice.c:985 [inline]
do_splice_read+0x282/0x370 fs/splice.c:959
splice_file_to_pipe+0x109/0x120 fs/splice.c:1295
do_sendfile+0x3fd/0xe40 fs/read_write.c:1369
__do_sys_sendfile64 fs/read_write.c:1424 [inline]
__se_sys_sendfile64 fs/read_write.c:1410 [inline]
__x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&p->lock --> sb_writers#6 --> &pipe->mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pipe->mutex);
lock(sb_writers#6);
lock(&pipe->mutex);
lock(&p->lock);
*** DEADLOCK ***
1 lock held by syz.4.3544/16863:
#0: ffff888024a08868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c:92 [inline]
#0: ffff888024a08868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock+0x64/0x80 fs/pipe.c:89
stack backtrace:
CPU: 1 UID: 0 PID: 16863 Comm: syz.4.3544 Not tainted 6.14.0-rc6-syzkaller-00007-g0b46b049d6ec #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain kernel/locking/lockdep.c:3906 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
proc_reg_read_iter+0x21d/0x310 fs/proc/inode.c:299
copy_splice_read+0x61d/0xb80 fs/splice.c:365
do_splice_read fs/splice.c:985 [inline]
do_splice_read+0x282/0x370 fs/splice.c:959
splice_file_to_pipe+0x109/0x120 fs/splice.c:1295
do_sendfile+0x3fd/0xe40 fs/read_write.c:1369
__do_sys_sendfile64 fs/read_write.c:1424 [inline]
__se_sys_sendfile64 fs/read_write.c:1410 [inline]
__x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1410
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5f618d169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa5f3ff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fa5f63a5fa0 RCX: 00007fa5f618d169
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007fa5f620e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 01fffe0000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa5f63a5fa0 R15: 00007ffc07b99168
</TASK>