------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:567 at hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:567, CPU#1: kworker/u9:7/5815
Modules linked in:
CPU: 1 UID: 0 PID: 5815 Comm: kworker/u9:7 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:567
Code: 44 0f b6 2d 73 d9 4d 06 31 ff 41 83 e5 40 44 89 ee e8 fa 61 81 f7 45 84 ed 0f 84 02 ff ff ff e9 36 75 ea f6 e8 97 67 81 f7 90 <0f> 0b 90 e8 8e 67 81 f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc90003f87c18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802c2e0a40 RCX: ffffffff8a87362f
RDX: ffff888036eb8000 RSI: ffffffff8a873729 RDI: ffff888036eb8000
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff88802c2e0000
R13: ffff888036eb8484 R14: ffffffff90d9b804 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124444000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f800ff8 CR3: 0000000060c38000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>