======================================================
WARNING: possible circular locking dependency detected
6.13.0-syzkaller-01005-gb9d8a295ed6b #0 Not tainted
------------------------------------------------------
syz.1.1723/13204 is trying to acquire lock:
ffff88802a040c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
but task is already holding lock:
ffff88801b732c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c:92 [inline]
ffff88801b732c68 (&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:
-> #3 (&pipe->mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
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+0x145c/0x1f60 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
-> #2 (sb_writers#6){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1739 [inline]
sb_start_write include/linux/fs.h:1875 [inline]
mnt_want_write+0x6f/0x450 fs/namespace.c:547
ovl_create_object+0x12e/0x300 fs/overlayfs/dir.c:656
lookup_open.isra.0+0x11c8/0x1580 fs/namei.c:3649
open_last_lookups fs/namei.c:3748 [inline]
path_openat+0x904/0x2d70 fs/namei.c:3984
do_filp_open+0x20c/0x470 fs/namei.c:4014
do_sys_openat2+0x17a/0x1e0 fs/open.c:1395
do_sys_open fs/open.c:1410 [inline]
__do_sys_creat fs/open.c:1488 [inline]
__se_sys_creat fs/open.c:1482 [inline]
__x64_sys_creat+0xcd/0x120 fs/open.c:1482
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 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1524
inode_lock_shared include/linux/fs.h:842 [inline]
lookup_slow fs/namei.c:1807 [inline]
walk_component+0x342/0x5b0 fs/namei.c:2112
lookup_last fs/namei.c:2610 [inline]
path_lookupat+0x17f/0x770 fs/namei.c:2634
filename_lookup+0x221/0x5f0 fs/namei.c:2663
kern_path+0x35/0x50 fs/namei.c:2771
lookup_bdev+0xd9/0x280 block/bdev.c:1163
resume_store+0x1d8/0x460 kernel/power/hibernate.c:1242
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
-> #0 (&of->mutex){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain kernel/locking/lockdep.c:3904 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
iter_file_splice_write+0x90f/0x10b0 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
do_splice+0x145c/0x1f60 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
other info that might help us debug this:
Chain exists of:
&of->mutex --> sb_writers#6 --> &pipe->mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pipe->mutex);
lock(sb_writers#6);
lock(&pipe->mutex);
lock(&of->mutex);
*** DEADLOCK ***
2 locks held by syz.1.1723/13204:
#0: ffff8880314aa420 (sb_writers#9){.+.+}-{0:0}, at: __do_splice+0x327/0x360 fs/splice.c:1436
#1: ffff88801b732c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c:92 [inline]
#1: ffff88801b732c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock+0x64/0x80 fs/pipe.c:89
stack backtrace:
CPU: 1 UID: 0 PID: 13204 Comm: syz.1.1723 Not tainted 6.13.0-syzkaller-01005-gb9d8a295ed6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain kernel/locking/lockdep.c:3904 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325
iter_file_splice_write+0x90f/0x10b0 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
do_splice+0x145c/0x1f60 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
RIP: 0033:0x7f1b9c185d29
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:00007f1b9cecf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f1b9c376080 RCX: 00007f1b9c185d29
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f1b9c201b08 R08: 000000000000bfd1 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f1b9c376080 R15: 00007ffe3e5d8618
</TASK>