------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current)
WARNING: kernel/locking/rtmutex_common.h:182 at debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:182 [inline], CPU#1: syz.1.347/9270
WARNING: kernel/locking/rtmutex_common.h:182 at rt_mutex_slowunlock+0x6d9/0x8b0 kernel/locking/rtmutex.c:1419, CPU#1: syz.1.347/9270
Modules linked in:
CPU: 1 UID: 0 PID: 9270 Comm: syz.1.347 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:182 [inline]
RIP: 0010:rt_mutex_slowunlock+0x6e0/0x8b0 kernel/locking/rtmutex.c:1419
Code: 6a 8f 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 83 3d 64 b7 46 04 00 75 13 48 8d 3d 77 c3 49 04 48 c7 c6 20 e8 4c 8b <67> 48 0f b9 3a 90 e9 2a fa ff ff 90 0f 0b 90 e9 4c fe ff ff be 02
RSP: 0018:ffffc90003b8f4a0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880610befb8 RCX: 0000000000080000
RDX: ffffc9001461a000 RSI: ffffffff8b4ce820 RDI: ffffffff8f6d4800
RBP: ffffc90003b8f590 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed477d R12: dffffc0000000000
R13: 1ffff92000771e9c R14: 0000000000000246 R15: ffff8880610bef68
FS: 00007f0ae1bfd6c0(0000) GS:ffff888126443000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f763dab5900 CR3: 000000005e376000 CR4: 00000000003526f0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:1038 [inline]
end_dirop+0x7d/0x90 fs/namei.c:2947
end_creating_keep include/linux/namei.h:147 [inline]
ovl_workdir_create+0x51d/0x940 fs/overlayfs/super.c:346
ovl_make_workdir fs/overlayfs/super.c:682 [inline]
ovl_get_workdir fs/overlayfs/super.c:840 [inline]
ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
ovl_fill_super+0x1a3f/0x5e00 fs/overlayfs/super.c:1564
vfs_get_super fs/super.c:1327 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1346
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3763 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3839
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ae39cc799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0ae1bfd028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0ae3c46090 RCX: 00007f0ae39cc799
RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f0ae3a62bd9 R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ae3c46128 R14: 00007f0ae3c46090 R15: 00007ffe2012ba88
</TASK>
----------------
Code disassembly (best guess):
0: 6a 8f push $0xffffffffffffff8f
2: 48 c1 e8 03 shr $0x3,%rax
6: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
b: 84 c0 test %al,%al
d: 0f 85 c0 01 00 00 jne 0x1d3
13: 83 3d 64 b7 46 04 00 cmpl $0x0,0x446b764(%rip) # 0x446b77e
1a: 75 13 jne 0x2f
1c: 48 8d 3d 77 c3 49 04 lea 0x449c377(%rip),%rdi # 0x449c39a
23: 48 c7 c6 20 e8 4c 8b mov $0xffffffff8b4ce820,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 90 nop
30: e9 2a fa ff ff jmp 0xfffffa5f
35: 90 nop
36: 0f 0b ud2
38: 90 nop
39: e9 4c fe ff ff jmp 0xfffffe8a
3e: be .byte 0xbe
3f: 02 .byte 0x2