------------[ 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.0.635/8118
WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12e2/0x1550 kernel/locking/mutex.c:821, CPU#0: syz.0.635/8118
Modules linked in:
CPU: 0 UID: 0 PID: 8118 Comm: syz.0.635 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x12e9/0x1550 kernel/locking/mutex.c:821
Code: 85 7a 90 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d 2b b5 94 04 00 75 13 48 8d 3d ee b0 97 04 48 c7 c6 80 0f 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:ffffc90006c8f7e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8880301d8000
RDX: 0000000000000000 RSI: ffffffff8c0d0f80 RDI: ffffffff907d8150
RBP: ffffc90006c8f978 R08: ffffffff907a8583 R09: 1ffffffff20f50b0
R10: dffffc0000000000 R11: fffffbfff20f50b1 R12: ffff88805240c108
R13: 0000000000000000 R14: 1ffff92000d91f10 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124cd5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a20fb7000 CR3: 000000005e37a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dvb_frontend_release+0x1bc/0x4d0 drivers/media/dvb-core/dvb_frontend.c:2942
 __fput+0x418/0xa50 fs/file_table.c:513
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2360 kernel/exit.c:1008
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
 get_signal+0x121b/0x12c0 kernel/signal.c:3039
 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:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f212679e0d9
Code: Unable to access opcode bytes at 0x7f212679e0af.
RSP: 002b:00007f21275a70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f2126a26098 RCX: 00007f212679e0d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2126a26098
RBP: 00007f2126a26090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2126a26128 R14: 00007ffc3f744ba0 R15: 00007ffc3f744c88
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 7a 90             	test   %edi,-0x70(%rdx)
   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 2b b5 94 04 00 	cmpl   $0x0,0x494b52b(%rip)        # 0x494b545
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d ee b0 97 04 	lea    0x497b0ee(%rip),%rdi        # 0x497b111
  23:	48 c7 c6 80 0f 0d 8c 	mov    $0xffffffff8c0d0f80,%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