------------[ cut here ]------------
workqueue: cannot queue hci_tx_work on wq hci1
WARNING: kernel/workqueue.c:2251 at __queue_work+0xcbb/0x10f0 kernel/workqueue.c:2250, CPU#2: kbnepd bnep0/8872
Modules linked in:
CPU: 2 UID: 0 PID: 8872 Comm: kbnepd bnep0 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+0xcbf/0x10f0 kernel/workqueue.c:2250
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 15 04 00 00 48 8d 3d 55 f5 eb 0e 48 8b 75 18 <67> 48 0f b9 3a e9 77 f7 ff ff e8 a2 b0 38 00 90 0f 0b 90 e9 ff f5
RSP: 0018:ffffc900060a77d0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1100566218d
RDX: ffff88805478a978 RSI: ffffffff8a6e7710 RDI: ffffffff90ba4000
RBP: ffff88802b310c50 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805478a800
R13: ffff88802d43a4c0 R14: 0000000000000055 R15: ffff888055183000
FS:  0000000000000000(0000) GS:ffff8880d67dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8ef0fe1198 CR3: 000000003a13f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 queue_work_on+0x180/0x1e0 kernel/workqueue.c:2386
 l2cap_chan_send+0x4ba/0x2ce0 net/bluetooth/l2cap_core.c:2611
 l2cap_sock_sendmsg+0x3e7/0x4b0 net/bluetooth/l2cap_sock.c:1139
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 sock_sendmsg+0x3a1/0x430 net/socket.c:765
 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline]
 bnep_session+0x1254/0x2da0 net/bluetooth/bnep/core.c:509
 kthread+0x3b3/0x730 kernel/kthread.c:463
 ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 15 04 00 00    	jne    0x434
  1f:	48 8d 3d 55 f5 eb 0e 	lea    0xeebf555(%rip),%rdi        # 0xeebf57b
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 77 f7 ff ff       	jmp    0xfffff7ab
  34:	e8 a2 b0 38 00       	call   0x38b0db
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	ff f5                	push   %rbp