Bluetooth: hci2: command 0x2016 tx timeout
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refcnt < 0
WARNING: net/bluetooth/hci_conn.c:641 at hci_conn_timeout+0xff/0x2c0, CPU#1: kworker/u11:1/5013
Modules linked in:
CPU: 1 UID: 0 PID: 5013 Comm: kworker/u11:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: hci2 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x2c0
Code: 48 89 df e8 83 f5 09 00 eb 07 e8 ac d9 f2 f6 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 27 a0 fe ff e8 92 d9 f2 f6 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:ffffc9002112fab0 EFLAGS: 00010293
RAX: ffffffff8ad4d4be RBX: ffff88816f88c000 RCX: ffff88817b0b0000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88816f88c013 R09: 1ffff1102df11802
R10: dffffc0000000000 R11: ffffed102df11803 R12: dffffc0000000000
R13: ffffffff818f94da R14: ffff88816f88ca50 R15: ffff88816f88c010
FS:  0000000000000000(0000) GS:ffff8882a8ce4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6b0ff0e5c CR3: 000000010cf5c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
