------------[ cut here ]------------
workqueue: cannot queue hci_conn_timeout on wq hci2
WARNING: kernel/workqueue.c:2305 at __queue_work+0xd2d/0x12b0 kernel/workqueue.c:2304, CPU#2: kworker/2:1/50
Modules linked in:
CPU: 2 UID: 0 PID: 50 Comm: kworker/2:1 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
Workqueue: events l2cap_chan_timeout
RIP: 0010:__queue_work+0xd31/0x12b0 kernel/workqueue.c:2304
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 52 05 00 00 48 8d 3d 13 82 10 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: 0000:ffffc9000071fa28 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff88801b8f4c00 RCX: 1ffff1100956914b
RDX: ffff888024d74970 RSI: ffffffff8a901670 RDI: ffffffff90deea00
RBP: ffff88804ab48a40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000000 R12: ffff888024d74800
R13: ffff88801dbd2540 R14: ffff88804ab48a88 R15: ffff88804ab48a48
FS:  0000000000000000(0000) GS:ffff8880972f0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080001080 CR3: 0000000060396000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __queue_delayed_work+0x357/0x450 kernel/workqueue.c:2568
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2620
 queue_delayed_work include/linux/workqueue.h:714 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1709 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1683 [inline]
 l2cap_chan_del+0x644/0x920 net/bluetooth/l2cap_core.c:673
 l2cap_chan_close+0x3b0/0xa70 net/bluetooth/l2cap_core.c:846
 l2cap_chan_timeout+0x211/0x3f0 net/bluetooth/l2cap_core.c:433
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 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 52 05 00 00    	jne    0x571
  1f:	48 8d 3d 13 82 10 0f 	lea    0xf108213(%rip),%rdi        # 0xf108239
  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