------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:631 at hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:631, CPU#1: kworker/u9:2/5630
Modules linked in:
CPU: 1 UID: 0 PID: 5630 Comm: kworker/u9:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: hci2 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:631
Code: 44 0f b6 2d eb 03 46 06 31 ff 41 83 e5 40 44 89 ee e8 5a 65 77 f7 45 84 ed 0f 84 02 ff ff ff e9 90 9d df f6 e8 37 6b 77 f7 90 <0f> 0b 90 e8 2e 6b 77 f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc90003fbfc18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802cb04a40 RCX: ffffffff8a91700f
RDX: ffff888034b8dd00 RSI: ffffffff8a917109 RDI: ffff888034b8dd00
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 000000000000751b R12: ffff88802cb04000
R13: ffff888034b8e1c4 R14: ffffffff90dc0f44 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881243e7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b348fdff8 CR3: 0000000076c76000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>