------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#0: syz.3.1149/13156
WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12e2/0x1550 kernel/locking/mutex.c:821, CPU#0: syz.3.1149/13156
Modules linked in:
CPU: 0 UID: 0 PID: 13156 Comm: syz.3.1149 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x12e9/0x1550 kernel/locking/mutex.c:821
Code: a5 7a 91 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d 6b 53 90 05 00 75 13 48 8d 3d 5e 50 93 05 48 c7 c6 a0 12 0d 8c <67> 48 0f b9 3a 90 e9 6b ee ff ff 90 0f 0b 90 e9 3e f2 ff ff 90 0f
RSP: 0018:ffffc900062477e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888030213e80
RDX: 0000000000000000 RSI: ffffffff8c0d12a0 RDI: ffffffff917da280
RBP: ffffc90006247978 R08: ffffffff917aa583 R09: 1ffffffff22f54b0
R10: dffffc0000000000 R11: fffffbfff22f54b1 R12: ffff888052910108
R13: 0000000000000000 R14: 1ffff92000c48f10 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123abf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38abdf4078 CR3: 0000000051a0b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dvb_frontend_release+0x1bc/0x4d0 drivers/media/dvb-core/dvb_frontend.c:2942
 __fput+0x40d/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2350 kernel/exit.c:986
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
 get_signal+0x121b/0x12c0 kernel/signal.c:3112
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e3cd9e1eb
Code: Unable to access opcode bytes at 0x7f4e3cd9e1c1.
RSP: 002b:00007f4e3a7eff50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f4e3cd9e1eb
RDX: 00007f4e3a7f0fe0 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f4e3ce35ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000200000000640
R13: 0000000000000000 R14: 00007f4e3d026360 R15: 00007ffd9f17f138
 </TASK>
----------------
Code disassembly (best guess):
   0:	a5                   	movsl  %ds:(%rsi),%es:(%rdi)
   1:	7a 91                	jp     0xffffff94
   3:	48 c1 e8 03          	shr    $0x3,%rax
   7:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax
   b:	84 c0                	test   %al,%al
   d:	0f 85 47 02 00 00    	jne    0x25a
  13:	83 3d 6b 53 90 05 00 	cmpl   $0x0,0x590536b(%rip)        # 0x5905385
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d 5e 50 93 05 	lea    0x593505e(%rip),%rdi        # 0x5935081
  23:	48 c7 c6 a0 12 0d 8c 	mov    $0xffffffff8c0d12a0,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	90                   	nop
  30:	e9 6b ee ff ff       	jmp    0xffffeea0
  35:	90                   	nop
  36:	0f 0b                	ud2
  38:	90                   	nop
  39:	e9 3e f2 ff ff       	jmp    0xfffff27c
  3e:	90                   	nop
  3f:	0f                   	.byte 0xf