syzbot

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workqueue: cannot queue hci_rx_work on wq hci0
WARNING: kernel/workqueue.c:2251 at __queue_work+0xc9d/0x10e0 kernel/workqueue.c:2250, CPU#3: syz.2.80/6361
Modules linked in:
CPU: 3 UID: 0 PID: 6361 Comm: syz.2.80 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+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 53 f5 06 0f 48 8b 75 18 <67> 48 0f b9 3a e9 90 f7 ff ff e8 10 34 3a 00 90 0f 0b 90 e9 15 f6
RSP: 0018:ffffc9000297fbe8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11006a0f17b
RDX: ffff888032458178 RSI: ffffffff8a6b9460 RDI: ffffffff908ba9e0
RBP: ffff888035078bc0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880287e0b30 R12: 0000000000000008
R13: ffff888032458000 R14: 0000000000000000 R15: ffff888032458000
FS:  00007f0a737796c0(0000) GS:ffff8880d6bf5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a73778f98 CR3: 0000000035ed6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 queue_work_on+0x1a4/0x1f0 kernel/workqueue.c:2386
 queue_work include/linux/workqueue.h:669 [inline]
 hci_recv_frame+0x503/0x880 net/bluetooth/hci_core.c:2968
 vhci_get_user drivers/bluetooth/hci_vhci.c:520 [inline]
 vhci_write+0x399/0x480 drivers/bluetooth/hci_vhci.c:616
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d3/0x11d0 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a7298e27f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f0a73779000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0a72be6090 RCX: 00007f0a7298e27f
RDX: 0000000000000007 RSI: 0000200000000040 RDI: 00000000000000ca
RBP: 00007f0a72a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f0a72be6128 R14: 00007f0a72be6090 R15: 00007ffe3b96d288
 </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 53 f5 06 0f 	lea    0xf06f553(%rip),%rdi        # 0xf06f579
  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 10 34 3a 00       	call   0x3a3449
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	15                   	.byte 0x15
  3f:	f6                   	.byte 0xf6