------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:631 at hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:631, CPU#0: kworker/u9:4/5635
Modules linked in:
CPU: 0 UID: 0 PID: 5635 Comm: kworker/u9:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: hci3 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:631
Code: 44 0f b6 2d 5b cf 70 06 31 ff 41 83 e5 40 44 89 ee e8 ea 2e 5c f7 45 84 ed 0f 84 02 ff ff ff e9 f0 64 c4 f6 e8 c7 34 5c f7 90 <0f> 0b 90 e8 be 34 5c f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000440fc18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802bc48a40 RCX: ffffffff8aacf67f
RDX: ffff8880758d1f00 RSI: ffffffff8aacf779 RDI: ffff8880758d1f00
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 000000000000756b R12: ffff88802bc48000
R13: ffff8880758d23c4 R14: ffffffff91227e44 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123df5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b348c3ff8 CR3: 00000000344d2000 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>