------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci0
WARNING: CPU: 2 PID: 6845 at kernel/workqueue.c:2255 __queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Modules linked in:
CPU: 2 UID: 0 PID: 6845 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4b 04 00 00 48 8b 75 18 4c 89 fa 48 c7 c7 a0 00 ac 8b e8 be 1e f7 ff 90 <0f> 0b 90 90 e9 2f f7 ff ff e8 ef 78 38 00 90 0f 0b 90 e9 b4 f5 ff
RSP: 0018:ffffc90000648be8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a3358
RDX: ffff8880291a0000 RSI: ffffffff817a3365 RDI: 0000000000000001
RBP: ffff888055250970 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff920000c918f
R13: 0000000080000100 R14: ffffffff81832460 R15: ffff8880360de978
FS:  0000000000000000(0000) GS:ffff8880d68b8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff333d1d28 CR3: 000000004f491000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000014 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1793 [inline]
 __run_timers+0x569/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5872
Code: b9 3e 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 52 8b 13 0f 0f 82 74 02 00 00 8b 35 0a bd 13 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 a9 b8 3e 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc900032b7908 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffff8880360de948 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8de2b508 RDI: ffffffff8c162980
RBP: 0000000000000000 R08: b92b706bcd515707 R09: ffffffff96bfce30
R10: 0000000000000008 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:3907
 __flush_workqueue+0x128/0x1230 kernel/workqueue.c:3949
 drain_workqueue+0x199/0x3d0 kernel/workqueue.c:4113
 hci_dev_close_sync+0x39b/0x11d0 net/bluetooth/hci_sync.c:5280
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:501
 hci_unregister_dev+0x227/0x640 net/bluetooth/hci_core.c:2715
 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:665
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x86f/0x2bf0 kernel/exit.c:961
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
 x64_sys_call+0x14fa/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f57e018ebe9
Code: Unable to access opcode bytes at 0x7f57e018ebbf.
RSP: 002b:00007fff333d43a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f57e0211c89 RCX: 00007f57e018ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007fff333d2147 R09: 00007fff333d5660
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff333d5660
R13: 00007f57e0211c05 R14: 0000555591ef74a8 R15: 00007fff333d6730
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	3e 12 83 f8 07 0f 87 	ds adc -0x78f0f808(%rbx),%al
   7:	bc 02 00 00 89       	mov    $0x89000002,%esp
   c:	c0 48 0f a3          	rorb   $0xa3,0xf(%rax)
  10:	05 52 8b 13 0f       	add    $0xf138b52,%eax
  15:	0f 82 74 02 00 00    	jb     0x28f
  1b:	8b 35 0a bd 13 0f    	mov    0xf13bd0a(%rip),%esi        # 0xf13bd2b
  21:	85 f6                	test   %esi,%esi
  23:	0f 85 8d 00 00 00    	jne    0xb6
* 29:	48 8b 44 24 30       	mov    0x30(%rsp),%rax <-- trapping instruction
  2e:	65 48 2b 05 a9 b8 3e 	sub    %gs:0x123eb8a9(%rip),%rax        # 0x123eb8df
  35:	12
  36:	0f 85 c7 02 00 00    	jne    0x303
  3c:	48                   	rex.W
  3d:	83                   	.byte 0x83
  3e:	c4                   	.byte 0xc4