syzbot

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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.2.109/6701
WARNING: kernel/locking/rtmutex_common.h:182 at rt_mutex_slowunlock+0x6d9/0x8b0 kernel/locking/rtmutex.c:1419, CPU#0: syz.2.109/6701
Modules linked in:
CPU: 0 UID: 0 PID: 6701 Comm: syz.2.109 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 e4 62 45 04 00 75 13 48 8d 3d 77 6f 48 04 48 c7 c6 80 f9 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:ffffc90005f8fce0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888061e6a288 RCX: 0000000000080000
RDX: ffffc90010967000 RSI: ffffffff8b4cf980 RDI: ffffffff8f6d7380
RBP: ffffc90005f8fdd0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed4cdd R12: dffffc0000000000
R13: 1ffff92000bf1fa4 R14: 0000000000000246 R15: ffff888061e6a238
FS:  00007f3ead2156c0(0000) GS:ffff888126339000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ead215d58 CR3: 00000000353ac000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1038 [inline]
 end_dirop fs/namei.c:2947 [inline]
 end_creating include/linux/namei.h:126 [inline]
 end_creating_path fs/namei.c:4962 [inline]
 filename_mknodat+0x45c/0x670 fs/namei.c:5156
 __do_sys_mknodat fs/namei.c:5173 [inline]
 __se_sys_mknodat+0x3b/0x150 fs/namei.c:5169
 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: 0033:0x7f3eaefdc799
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:00007f3ead215028 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f3eaf256090 RCX: 00007f3eaefdc799
RDX: 00000000000081c0 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f3eaf072c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3eaf256128 R14: 00007f3eaf256090 R15: 00007ffcd15071c8
 </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 e4 62 45 04 00 	cmpl   $0x0,0x44562e4(%rip)        # 0x44562fe
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d 77 6f 48 04 	lea    0x4486f77(%rip),%rdi        # 0x4486f9a
  23:	48 c7 c6 80 f9 4c 8b 	mov    $0xffffffff8b4cf980,%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