Bluetooth: MGMT ver 1.23
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workqueue: cannot queue hci_cmd_work on wq hci0
WARNING: kernel/workqueue.c:2306 at __queue_work+0xd4a/0x10a0 kernel/workqueue.c:2305, CPU#0: syz.0.0/5332
Modules linked in:
CPU: 0 UID: 0 PID: 5332 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xd66/0x10a0 kernel/workqueue.c:2305
Code: 49 81 c7 70 01 00 00 4c 8d 35 36 8c cd 0e 48 89 f8 48 c1 e8 03 80 3c 18 00 74 05 e8 94 62 a8 00 49 8b 75 18 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8
RSP: 0018:ffffc9000f91f778 EFLAGS: 00010046
RAX: 1ffff1100256a981 RBX: dffffc0000000000 RCX: ffff88801ae80000
RDX: ffff8880125e1970 RSI: ffffffff8ac37fe0 RDI: ffffffff905ad690
RBP: 0000000000000000 R08: ffff888012b54bf7 R09: 1ffff1100256a97e
R10: dffffc0000000000 R11: ffffed100256a97f R12: 0000000000000008
R13: ffff888012b54bf0 R14: ffffffff905ad690 R15: ffff8880125e1970
FS:  00007fd26484f6c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055657bb754b0 CR3: 0000000012b00000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
 queue_work include/linux/workqueue.h:699 [inline]
 hci_send_cmd+0xb7/0x1a0 net/bluetooth/hci_core.c:3073
 set_link_security+0x5b1/0x770 net/bluetooth/mgmt.c:1931
 hci_mgmt_cmd+0xa2c/0xfc0 net/bluetooth/hci_sock.c:1719
 hci_sock_sendmsg+0x6e1/0xf50 net/bluetooth/hci_sock.c:1839
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 sock_write_iter+0x2de/0x3e0 net/socket.c:1241
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd26399de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd26484efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd263c26090 RCX: 00007fd26399de99
RDX: 0000000000000007 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007fd263a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd263c26128 R14: 00007fd263c26090 R15: 00007ffefa991058
 </TASK>
----------------
Code disassembly (best guess):
   0:	49 81 c7 70 01 00 00 	add    $0x170,%r15
   7:	4c 8d 35 36 8c cd 0e 	lea    0xecd8c36(%rip),%r14        # 0xecd8c44
   e:	48 89 f8             	mov    %rdi,%rax
  11:	48 c1 e8 03          	shr    $0x3,%rax
  15:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  19:	74 05                	je     0x20
  1b:	e8 94 62 a8 00       	call   0xa862b4
  20:	49 8b 75 18          	mov    0x18(%r13),%rsi
  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:	4c 89 e8             	mov    %r13,%rax
  32:	48 c1 e8 03          	shr    $0x3,%rax
  36:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  3a:	74 08                	je     0x44
  3c:	4c 89 ef             	mov    %r13,%rdi
  3f:	e8                   	.byte 0xe8