------------[ 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.2.204/7226
WARNING: kernel/locking/rtmutex_common.h:182 at rt_mutex_slowunlock+0x6c0/0x8a0 kernel/locking/rtmutex.c:1419, CPU#1: syz.2.204/7226
Modules linked in:
CPU: 1 UID: 0 PID: 7226 Comm: syz.2.204 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+0x6c7/0x8a0 kernel/locking/rtmutex.c:1419
Code: db 8e 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 83 3d 4d 01 08 04 00 75 13 48 8d 3d 30 01 0b 04 48 c7 c6 e0 1e eb 8a <67> 48 0f b9 3a 90 e9 35 fa ff ff 90 0f 0b 90 e9 59 fe ff ff be 02
RSP: 0018:ffffc90004757b80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88804a655fe0 RCX: 0000000000080000
RDX: ffffc9000f3e5000 RSI: ffffffff8aeb1ee0 RDI: ffffffff8ede4460
RBP: ffffc90004757c68 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1db688f R12: dffffc0000000000
R13: ffff88804a655f90 R14: 0000000000000246 R15: 1ffff920008eaf78
FS: 00007f6dc413d6c0(0000) GS:ffff888126def000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6dc413cf98 CR3: 0000000029004000 CR4: 00000000003526f0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:1037 [inline]
__unlock_mount fs/namespace.c:2786 [inline]
unlock_mount+0xbd/0x3a0 fs/namespace.c:2796
do_new_mount_fc fs/namespace.c:3659 [inline]
do_new_mount+0x72e/0xa10 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6dc5eff749
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:00007f6dc413d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6dc6156090 RCX: 00007f6dc5eff749
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f6dc5f83f91 R08: 0000200000000040 R09: 0000000000000000
R10: 0000000000000400 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6dc6156128 R14: 00007f6dc6156090 R15: 00007fff2626fb08
</TASK>
----------------
Code disassembly (best guess):
0: db 8e 48 c1 e8 03 fisttpl 0x3e8c148(%rsi)
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 4d 01 08 04 00 cmpl $0x0,0x408014d(%rip) # 0x4080167
1a: 75 13 jne 0x2f
1c: 48 8d 3d 30 01 0b 04 lea 0x40b0130(%rip),%rdi # 0x40b0153
23: 48 c7 c6 e0 1e eb 8a mov $0xffffffff8aeb1ee0,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 90 nop
30: e9 35 fa ff ff jmp 0xfffffa6a
35: 90 nop
36: 0f 0b ud2
38: 90 nop
39: e9 59 fe ff ff jmp 0xfffffe97
3e: be .byte 0xbe
3f: 02 .byte 0x2