------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci0
WARNING: kernel/workqueue.c:2297 at __queue_work+0xcee/0x1130 kernel/workqueue.c:2296, CPU#3: pool_workqueue_/3
Modules linked in:
CPU: 3 UID: 0 PID: 3 Comm: pool_workqueue_ Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xcf2/0x1130 kernel/workqueue.c:2296
Code: 00 00 00 fc ff df 49 8d 94 24 70 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 00 04 00 00 48 8d 3d 92 92 0b 0f 48 8b 75 18 <67> 48 0f b9 3a e9 44 f7 ff ff e8 3f 82 39 00 90 0f 0b 90 e9 cc f5
RSP: 0018:ffffc900006f8bd0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000100 RCX: 1ffff1100738494e
RDX: ffff8880362ca970 RSI: ffffffff8a7fa420 RDI: ffffffff90da9c20
RBP: ffff888039c24a58 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000000 R12: ffff8880362ca800
R13: 1ffff920000df18d R14: ffffffff81cf1aa0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880d6676000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3e6037 CR3: 0000000040936000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x19a/0x640 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1794 [inline]
 __run_timers+0x583/0xaf0 kernel/time/timer.c:2374
 __run_timer_base kernel/time/timer.c:2386 [inline]
 __run_timer_base kernel/time/timer.c:2378 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2395
 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405
 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7513
Code: 00 00 00 fc ff df 48 89 eb 48 c1 eb 03 48 01 d3 f6 c4 02 75 47 bf 01 00 00 00 e8 b0 b8 49 f6 e8 7b 8b 85 f6 fb bf 01 00 00 00 <e8> e0 8f ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 de 56 49
RSP: 0018:ffffc90000067c58 EFLAGS: 00000202
RAX: 0000000000007eb3 RBX: ffffed1003bdf4a0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df1fe7a RDI: 0000000000000001
RBP: ffff88801defa500 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x12b/0x1d0 kernel/locking/lockdep.c:6616
Code: e8 da dd ff ff 48 83 2d 1a 44 46 14 01 89 c3 e8 2b e0 ff ff 9c 58 f6 c4 02 0f 85 8a 00 00 00 f7 c5 00 02 00 00 74 01 fb 84 db <75> 40 5b 5d 41 5c e9 0a 9d 09 00 9c 58 f6 c4 02 0f 84 16 ff ff ff
RSP: 0018:ffffc90000067d58 EFLAGS: 00000246
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8e0114f3 RDI: ffffffff8c1c3600
RBP: 0000000000000246 R08: 000000000008b151 R09: ffffffff963bce82
R10: 0000000000000200 R11: 0000000000000000 R12: ffffffff978f6c38
R13: ffff88804be09800 R14: ffff88804be09808 R15: ffff888053bd3801
 wq_unregister_lockdep kernel/workqueue.c:4929 [inline]
 pwq_release_workfn+0x618/0xb40 kernel/workqueue.c:5225
 kthread_worker_fn+0x2fa/0xc00 kernel/kthread.c:1025
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 fc                	add    %bh,%ah
   4:	ff                   	lcall  (bad)
   5:	df 49 8d             	fisttps -0x73(%rcx)
   8:	94                   	xchg   %eax,%esp
   9:	24 70                	and    $0x70,%al
   b:	01 00                	add    %eax,(%rax)
   d:	00 48 89             	add    %cl,-0x77(%rax)
  10:	f9                   	stc
  11:	48 c1 e9 03          	shr    $0x3,%rcx
  15:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  19:	0f 85 00 04 00 00    	jne    0x41f
  1f:	48 8d 3d 92 92 0b 0f 	lea    0xf0b9292(%rip),%rdi        # 0xf0b92b8
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 44 f7 ff ff       	jmp    0xfffff778
  34:	e8 3f 82 39 00       	call   0x398278
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	cc                   	int3
  3f:	f5                   	cmc