------------[ 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: kworker/0:6/5315
WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12e2/0x1550 kernel/locking/mutex.c:821, CPU#0: kworker/0:6/5315
Modules linked in:
CPU: 0 UID: 0 PID: 5315 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events virtio_gpu_array_put_free_work
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x12e9/0x1550 kernel/locking/mutex.c:821
Code: c6 7a 91 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 47 02 00 00 83 3d ab 94 8e 05 00 75 13 48 8d 3d 9e 91 91 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:ffffc9000dd17860 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88800f9f0000
RDX: 0000000000000000 RSI: ffffffff8c0d12a0 RDI: ffffffff917dc380
RBP: ffffc9000dd179f0 R08: ffffffff917ac683 R09: 1ffffffff22f58d0
R10: dffffc0000000000 R11: fffffbfff22f58d1 R12: ffff888000f351c0
R13: 0000000000000000 R14: 1ffff92001ba2f20 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f269e9909c0 CR3: 000000004467b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 virtio_gpu_remove_from_restore_list drivers/gpu/drm/virtio/virtgpu_object.c:70 [inline]
 virtio_gpu_free_object+0x90/0x1d0 drivers/gpu/drm/virtio/virtgpu_object.c:106
 kref_put include/linux/kref.h:65 [inline]
 __drm_gem_object_put include/drm/drm_gem.h:562 [inline]
 drm_gem_object_put include/drm/drm_gem.h:575 [inline]
 virtio_gpu_array_put_free+0x114/0x240 drivers/gpu/drm/virtio/virtgpu_gem.c:288
 virtio_gpu_array_put_free_work+0x168/0x1c0 drivers/gpu/drm/virtio/virtgpu_gem.c:313
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	7a 91                	jp     0xffffff93
   2:	48 c1 e8 03          	shr    $0x3,%rax
   6:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax
   a:	84 c0                	test   %al,%al
   c:	0f 85 47 02 00 00    	jne    0x259
  12:	83 3d ab 94 8e 05 00 	cmpl   $0x0,0x58e94ab(%rip)        # 0x58e94c4
  19:	75 13                	jne    0x2e
  1b:	48 8d 3d 9e 91 91 05 	lea    0x591919e(%rip),%rdi        # 0x59191c0
  22:	48 c7 c6 a0 12 0d 8c 	mov    $0xffffffff8c0d12a0,%rsi
* 29:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2e:	90                   	nop
  2f:	e9 6b ee ff ff       	jmp    0xffffee9f
  34:	90                   	nop
  35:	0f 0b                	ud2
  37:	90                   	nop
  38:	e9 3e f2 ff ff       	jmp    0xfffff27b
  3d:	90                   	nop
  3e:	0f                   	.byte 0xf