------------[ cut here ]------------
WARNING: CPU: 0 PID: 4703 at net/bluetooth/hci_conn.c:567 hci_conn_timeout+0xff/0x290 net/bluetooth/hci_conn.c:567
Modules linked in:
CPU: 0 UID: 0 PID: 4703 Comm: kworker/u5:1 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
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x290 net/bluetooth/hci_conn.c:567
Code: 48 89 df e8 23 10 09 00 eb 07 e8 3c 5d 46 f7 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 87 c4 fe ff e8 22 5d 46 f7 90 <0f> 0b 90 eb 8c 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 31 ff ff ff
RSP: 0018:ffffc90002a1fa50 EFLAGS: 00010293
RAX: ffffffff8a795e1e RBX: ffff888052e74000 RCX: ffff88801f612440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888052e74013 R09: 1ffff1100a5ce802
R10: dffffc0000000000 R11: ffffed100a5ce803 R12: dffffc0000000000
R13: ffff88805b36c018 R14: ffff888052e74948 R15: ffff888052e74010
FS:  0000000000000000(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556f61c7c8 CR3: 0000000040306000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>