------------[ cut here ]------------
workqueue: cannot queue hci_tx_work on wq hci0
WARNING: kernel/workqueue.c:2252 at 0x0, CPU#0: khidpd_00010003/5342
Modules linked in:
CPU: 0 UID: 0 PID: 5342 Comm: khidpd_00010003 Not tainted syzkaller #0 PREEMPT(full) 
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+0xd4b/0xf90 kernel/workqueue.c:2250
Code: 83 c5 18 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 26 78 9e 00 49 8b 75 00 49 81 c7 78 01 00 00 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 48 83 c4 58 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc
RSP: 0018:ffffc9000d537310 EFLAGS: 00010086
RAX: 1ffff1100220098d RBX: 0000000000000008 RCX: ffff8880006b24c0
RDX: ffff88804279e178 RSI: ffffffff8a474050 RDI: ffffffff8f8371d0
RBP: 0000000000000000 R08: ffff888011004c57 R09: 1ffff1100220098a
R10: dffffc0000000000 R11: ffffed100220098b R12: dffffc0000000000
R13: ffff888011004c68 R14: ffffffff8f8371d0 R15: ffff88804279e178
FS:  0000000000000000(0000) GS:ffff88808d69f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000053c000 CR3: 0000000019f53000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 queue_work_on+0x181/0x270 kernel/workqueue.c:2386
 l2cap_chan_send+0x1110/0x2790 net/bluetooth/l2cap_core.c:-1
 l2cap_sock_sendmsg+0x32e/0x4a0 net/bluetooth/l2cap_sock.c:1139
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:733
 sock_sendmsg net/socket.c:756 [inline]
 kernel_sendmsg+0x175/0x250 net/socket.c:780
 hidp_send_frame net/bluetooth/hidp/core.c:627 [inline]
 hidp_process_transmit+0x18f/0x380 net/bluetooth/hidp/core.c:641
 hidp_session_run+0x8df/0x14a0 net/bluetooth/hidp/core.c:1221
 hidp_session_thread+0x28e/0x410 net/bluetooth/hidp/core.c:1288
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 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:	83 c5 18             	add    $0x18,%ebp
   3:	4c 89 e8             	mov    %r13,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   f:	74 08                	je     0x19
  11:	4c 89 ef             	mov    %r13,%rdi
  14:	e8 26 78 9e 00       	call   0x9e783f
  19:	49 8b 75 00          	mov    0x0(%r13),%rsi
  1d:	49 81 c7 78 01 00 00 	add    $0x178,%r15
  24:	4c 89 f7             	mov    %r14,%rdi
  27:	4c 89 fa             	mov    %r15,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 58          	add    $0x58,%rsp
  33:	5b                   	pop    %rbx
  34:	41 5c                	pop    %r12
  36:	41 5d                	pop    %r13
  38:	41 5e                	pop    %r14
  3a:	41 5f                	pop    %r15
  3c:	5d                   	pop    %rbp
  3d:	c3                   	ret
  3e:	cc                   	int3
  3f:	cc                   	int3