------------[ cut here ]------------
workqueue: cannot queue hci_tx_work on wq hci0
WARNING: kernel/workqueue.c:2251 at 0x0, CPU#0: syz.0.21534/19084
Modules linked in:
CPU: 0 UID: 0 PID: 19084 Comm: syz.0.21534 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~bpo12+1 04/01/2014
RIP: 0010:__queue_work+0xca1/0x10e0 kernel/workqueue.c:2250
Code: 78 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 0c 04 00 00 48 8d 3d e3 95 06 0f 48 8b 75 18 <67> 48 0f b9 3a e9 90 f7 ff ff e8 30 cf 39 00 90 0f 0b 90 e9 15 f6
RSP: 0018:ffffc9000d64f6e0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1100a88118d
RDX: ffff88802ad42178 RSI: ffffffff8a5b2b20 RDI: ffffffff908a72f0
RBP: ffff888054408c50 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000349e759b R12: 0000000000000008
R13: ffff88802ad42000 R14: 0000000000000000 R15: ffff88802ad42000
FS:  0000000000000000(0000) GS:ffff88809775b000(0063) knlGS:00000000f53edb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000008000501c CR3: 000000004c8b8000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 queue_work_on+0x1a4/0x1f0 kernel/workqueue.c:2386
 l2cap_chan_send+0xce5/0x2c50 net/bluetooth/l2cap_core.c:2611
 l2cap_sock_sendmsg+0x3c7/0x490 net/bluetooth/l2cap_sock.c:1139
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
 __sys_sendmmsg+0x2f9/0x420 net/socket.c:2728
 __compat_sys_sendmmsg net/compat.c:360 [inline]
 __do_compat_sys_sendmmsg net/compat.c:367 [inline]
 __se_compat_sys_sendmmsg net/compat.c:364 [inline]
 __ia32_compat_sys_sendmmsg+0x9d/0x100 net/compat.c:364
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf6ffd579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f53ed55c EFLAGS: 00000296 ORIG_RAX: 0000000000000159
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080004640
RDX: 000000000000021d RSI: 0000000004048044 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	78 01                	js     0x3
   2:	00 00                	add    %al,(%rax)
   4:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   b:	fc ff df
   e:	48 89 f9             	mov    %rdi,%rcx
  11:	48 c1 e9 03          	shr    $0x3,%rcx
  15:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  19:	0f 85 0c 04 00 00    	jne    0x42b
  1f:	48 8d 3d e3 95 06 0f 	lea    0xf0695e3(%rip),%rdi        # 0xf069609
  26:	48 8b 75 18          	mov    0x18(%rbp),%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 90 f7 ff ff       	jmp    0xfffff7c4
  34:	e8 30 cf 39 00       	call   0x39cf69
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	15                   	.byte 0x15
  3f:	f6                   	.byte 0xf6