------------[ cut here ]------------
WARNING: net/bluetooth/hci_conn.c:567 at hci_conn_timeout+0x16f/0x230 net/bluetooth/hci_conn.c:567, CPU#0: kworker/u33:4/5941
Modules linked in:
CPU: 0 UID: 0 PID: 5941 Comm: kworker/u33:4 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: hci1 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 bf b4 4f f7 45 84 ed 0f 84 07 ff ff ff e8 71 ba 4f f7 e8 3c 6f fd 00 e9 f8 fe ff ff e8 62 ba 4f f7 90 <0f> 0b 90 e8 59 ba 4f f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc90003f0fbb0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888035df8a40 RCX: ffffffff8a6f2b2f
RDX: ffff8880337e0000 RSI: ffffffff8a6f2c2e RDI: 0000000000000005
RBP: 00000000ffffffdf R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffdf R11: 0000000000002ba1 R12: ffff888035df8000
R13: 0000000000000000 R14: ffffc90003f0fc90 R15: ffff888100aa1c00
FS:  0000000000000000(0000) GS:ffff8880d68f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004500 CR3: 00000000249bf000 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>