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workqueue: cannot queue hci_conn_timeout on wq hci3
WARNING: kernel/workqueue.c:2270 at __queue_work+0xd08/0x1150 kernel/workqueue.c:2269, CPU#1: kworker/1:4/5972
Modules linked in:
CPU: 1 UID: 0 PID: 5972 Comm: kworker/1:4 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+0xd0c/0x1150 kernel/workqueue.c:2269
Code: 00 00 00 fc ff df 49 8d 94 24 78 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 04 04 00 00 48 8d 3d 98 66 0c 0f 48 8b 75 18 <67> 48 0f b9 3a e9 2a f7 ff ff e8 25 d0 38 00 90 0f 0b 90 e9 b2 f5
RSP: 0018:ffffc90004577a30 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff88801b8f1000 RCX: 1ffff11007e7414b
RDX: ffff88803d82f178 RSI: ffffffff8a85df90 RDI: ffffffff90dc2f20
RBP: ffff88803f3a0a40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000000 R12: ffff88803d82f000
R13: ffff888033382480 R14: ffff88803f3a0a88 R15: ffff88803f3a0a48
FS:  0000000000000000(0000) GS:ffff8880d6452000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb10a833ff8 CR3: 0000000042805000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __queue_delayed_work+0x365/0x470 kernel/workqueue.c:2522
 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2574
 queue_delayed_work include/linux/workqueue.h:684 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1712 [inline]
 hci_conn_drop include/net/bluetooth/hci_core.h:1686 [inline]
 l2cap_chan_del+0x649/0x930 net/bluetooth/l2cap_core.c:672
 l2cap_chan_close+0x3b0/0xa70 net/bluetooth/l2cap_core.c:845
 l2cap_chan_timeout+0x196/0x330 net/bluetooth/l2cap_core.c:431
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 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 78                	and    $0x78,%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 04 04 00 00    	jne    0x423
  1f:	48 8d 3d 98 66 0c 0f 	lea    0xf0c6698(%rip),%rdi        # 0xf0c66be
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 2a f7 ff ff       	jmp    0xfffff75e
  34:	e8 25 d0 38 00       	call   0x38d05e
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	b2 f5                	mov    $0xf5,%dl