------------[ cut here ]------------
WARNING: net/bluetooth/hci_conn.c:567 at hci_conn_timeout+0x16f/0x230 net/bluetooth/hci_conn.c:567, CPU#3: kworker/u33:2/5940
Modules linked in:
CPU: 3 UID: 0 PID: 5940 Comm: kworker/u33:2 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
Workqueue: hci3 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16f/0x230 net/bluetooth/hci_conn.c:567
Code: 41 83 e5 40 44 89 ee e8 ff 1b 4f f7 45 84 ed 0f 84 07 ff ff ff e8 b1 21 4f f7 e8 3c 7d fd 00 e9 f8 fe ff ff e8 a2 21 4f f7 90 <0f> 0b 90 e8 99 21 4f f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc90003b1fbb0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805381ca40 RCX: ffffffff8a6fdcef
RDX: ffff888029a124c0 RSI: ffffffff8a6fddee RDI: 0000000000000005
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000002ba1 R12: ffff88805381c000
R13: 0000000000000000 R14: ffffc90003b1fc90 R15: ffff888102381c00
FS:  0000000000000000(0000) GS:ffff8880d6bf1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49ea7b1492 CR3: 000000005656f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>