------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current)
WARNING: kernel/locking/rtmutex_common.h:193 at debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:193 [inline], CPU#0: syz.0.31/5942
WARNING: kernel/locking/rtmutex_common.h:193 at rt_mutex_slowunlock+0x732/0xa20 kernel/locking/rtmutex.c:1432, CPU#0: syz.0.31/5942
Modules linked in:
CPU: 0 UID: 0 PID: 5942 Comm: syz.0.31 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:debug_rt_mutex_unlock kernel/locking/rtmutex_common.h:193 [inline]
RIP: 0010:rt_mutex_slowunlock+0x739/0xa20 kernel/locking/rtmutex.c:1432
Code: af 8f 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 cf 02 00 00 83 3d db 53 6b 04 00 75 13 48 8d 3d 3e 98 6e 04 48 c7 c6 a0 ff 6c 8b <67> 48 0f b9 3a 90 e9 d1 f9 ff ff 48 8d 3d 35 98 6e 04 67 48 0f b9
RSP: 0018:ffffc9000667fbc0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888062203130 RCX: 0000000000080000
RDX: ffffc90012c13000 RSI: ffffffff8b6cffa0 RDI: ffffffff8fb2e3b0
RBP: ffffc9000667fcb0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5f3e9 R12: dffffc0000000000
R13: 1ffff92000ccff80 R14: ffff8880622030e0 R15: 0000000000000246
FS:  00007fb6485916c0(0000) GS:ffff888125c46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005653a5ff2168 CR3: 0000000031990000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1034 [inline]
 __unlock_mount fs/namespace.c:2808 [inline]
 unlock_mount fs/namespace.c:2818 [inline]
 do_new_mount_fc fs/namespace.c:3788 [inline]
 do_new_mount+0x82d/0xdc0 fs/namespace.c:3841
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb64a79de99
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:00007fb648591028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb64aa26270 RCX: 00007fb64a79de99
RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 0000000000000000
RBP: 00007fb64a833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000001214040 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb64aa26308 R14: 00007fb64aa26270 R15: 00007ffe31461b18
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax
   9:	84 c0                	test   %al,%al
   b:	0f 85 cf 02 00 00    	jne    0x2e0
  11:	83 3d db 53 6b 04 00 	cmpl   $0x0,0x46b53db(%rip)        # 0x46b53f3
  18:	75 13                	jne    0x2d
  1a:	48 8d 3d 3e 98 6e 04 	lea    0x46e983e(%rip),%rdi        # 0x46e985f
  21:	48 c7 c6 a0 ff 6c 8b 	mov    $0xffffffff8b6cffa0,%rsi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	90                   	nop
  2e:	e9 d1 f9 ff ff       	jmp    0xfffffa04
  33:	48 8d 3d 35 98 6e 04 	lea    0x46e9835(%rip),%rdi        # 0x46e986f
  3a:	67                   	addr32
  3b:	48                   	rex.W
  3c:	0f                   	.byte 0xf
  3d:	b9                   	.byte 0xb9