------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci0
WARNING: kernel/workqueue.c:2297 at __queue_work+0xcee/0x1270 kernel/workqueue.c:2296, CPU#0: dhcpcd-run-hook/18786
Modules linked in:
CPU: 0 UID: 0 PID: 18786 Comm: dhcpcd-run-hook 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+0xcf2/0x1270 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 3d 05 00 00 48 8d 3d 72 0b 0b 0f 48 8b 75 18 <67> 48 0f b9 3a 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03
RSP: 0018:ffffc90000007bd0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000100 RCX: 1ffff110058f994e
RDX: ffff88804f745970 RSI: ffffffff8a7e87d0 RDI: ffffffff90da1580
RBP: ffff88802c7cca58 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000000 R12: ffff88804f745800
R13: 1ffff92000000f8d R14: ffffffff81cf0fa0 R15: 0000000000000001
FS:  00007f9d5ee63c80(0000) GS:ffff8880d6383000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbfc9720e9c CR3: 00000000521fd000 CR4: 0000000000352ef0
DR0: 0000000000000800 DR1: 00000000000001f8 DR2: 0000000000000003
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:302 [inline]
RIP: 0010:_raw_write_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:362
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 6a 45 58 f6 48 89 df e8 02 9d 58 f6 e8 6d a9 84 f6 fb bf 01 00 00 00 <e8> 62 61 48 f6 65 8b 05 4b 95 7d 08 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc90007fe78f0 EFLAGS: 00000202
RAX: 0000000000004b3d RBX: ffffffff8e40a080 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df0ecd2 RDI: 0000000000000001
RBP: ffff888046892628 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888046892540 R14: dffffc0000000000 R15: ffff88802a506f00
 release_task+0xd37/0x1ab0 kernel/exit.c:289
 wait_task_zombie kernel/exit.c:1281 [inline]
 wait_consider_task+0x1791/0x3e00 kernel/exit.c:1508
 do_wait_thread kernel/exit.c:1571 [inline]
 __do_wait+0x218/0x8b0 kernel/exit.c:1689
 do_wait+0x1ec/0x580 kernel/exit.c:1723
 kernel_wait4+0x16d/0x280 kernel/exit.c:1882
 __do_sys_wait4+0x161/0x170 kernel/exit.c:1910
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d5efb3407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdc06476c0 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00007f9d5ee63c80 RCX: 00007f9d5efb3407
RDX: 0000000000000000 RSI: 00007ffdc064772c RDI: ffffffffffffffff
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000564222c42280
R13: 0000000000000001 R14: 0000564222c3a2c0 R15: 00007f9d5f1cd460
 </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 3d 05 00 00    	jne    0x55c
  1f:	48 8d 3d 72 0b 0b 0f 	lea    0xf0b0b72(%rip),%rdi        # 0xf0b0b98
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  36:	fc ff df
  39:	48 89 ea             	mov    %rbp,%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx