------------[ 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#0: syz.4.151/6985
WARNING: kernel/locking/rtmutex_common.h:182 at rt_mutex_slowunlock+0x6d9/0x8b0 kernel/locking/rtmutex.c:1419, CPU#0: syz.4.151/6985
Modules linked in:
CPU: 0 UID: 0 PID: 6985 Comm: syz.4.151 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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: 1b 8f 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 83 3d 34 e2 2c 04 00 75 13 48 8d 3d 27 e3 2f 04 48 c7 c6 00 1f 0b 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:ffffc90004c5f4c0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888061491ab0 RCX: 0000000000080000
RDX: ffffc90012024000 RSI: ffffffff8b0b1f00 RDI: ffffffff8f1e8170
RBP: ffffc90004c5f5b0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3700f R12: dffffc0000000000
R13: 1ffff9200098bea0 R14: 0000000000000246 R15: ffff888061491a60
FS:  00007f38a52146c0(0000) GS:ffff8881268d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f610ff8 CR3: 00000000542c2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1037 [inline]
 end_dirop+0x7d/0x90 fs/namei.c:2897
 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+0x1a1e/0x5e60 fs/overlayfs/super.c:1567
 vfs_get_super fs/super.c:1324 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1343
 vfs_get_tree+0x92/0x2a0 fs/super.c:1751
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3636 [inline]
 do_new_mount+0x329/0xa50 fs/namespace.c:3712
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f38a6ffacb9
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:00007f38a5214028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f38a7276180 RCX: 00007f38a6ffacb9
RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f38a7068bf7 R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f38a7276218 R14: 00007f38a7276180 R15: 00007ffd0effbc98
 </TASK>
----------------
Code disassembly (best guess):
   0:	1b 8f 48 c1 e8 03    	sbb    0x3e8c148(%rdi),%ecx
   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 34 e2 2c 04 00 	cmpl   $0x0,0x42ce234(%rip)        # 0x42ce24e
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d 27 e3 2f 04 	lea    0x42fe327(%rip),%rdi        # 0x42fe34a
  23:	48 c7 c6 00 1f 0b 8b 	mov    $0xffffffff8b0b1f00,%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