------------[ cut here ]------------
workqueue: cannot queue hci_conn_timeout on wq hci2
WARNING: kernel/workqueue.c:2252 at __queue_work+0xd1f/0xf90, CPU#1: kworker/1:4/5869
Modules linked in:
CPU: 1 UID: 0 PID: 5869 Comm: kworker/1:4 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events l2cap_chan_timeout
RIP: 0010:__queue_work+0xd4a/0xf90
Code: 83 c5 18 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 87 c2 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 e9 be c1
RSP: 0018:ffffc90004907848 EFLAGS: 00010086
RAX: 1ffff1102eb2994b RBX: 0000000000000008 RCX: ffff8881695c57c0
RDX: ffff8881114e7978 RSI: ffffffff8a71b6b0 RDI: ffffffff8fd1e1e0
RBP: 0000000000000020 R08: ffff88817594ca47 R09: 1ffff1102eb29948
R10: dffffc0000000000 R11: ffffed102eb29949 R12: dffffc0000000000
R13: ffff88817594ca58 R14: ffffffff8fd1e1e0 R15: ffff8881114e7978
FS:  0000000000000000(0000) GS:ffff8882a9923000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f780420950 CR3: 000000016cb02000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 queue_delayed_work_on+0x11a/0x1d0
 l2cap_chan_del+0x285/0x610
 l2cap_chan_close+0x4d7/0x770
 l2cap_chan_timeout+0x158/0x3b0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
