------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:567 at hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:567, CPU#1: kworker/u9:6/5833
Modules linked in:
CPU: 1 UID: 0 PID: 5833 Comm: kworker/u9:6 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: hci4 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:567
Code: 48 89 df e8 83 99 09 00 eb 07 e8 1c b6 24 f7 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 87 a8 fe ff e8 02 b6 24 f7 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:ffffc90004007b10 EFLAGS: 00010293
RAX: ffffffff8aa0ea7e RBX: ffff88802dcec000 RCX: ffff888075863c80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88802dcec013 R09: 1ffff11005b9d802
R10: dffffc0000000000 R11: ffffed1005b9d803 R12: dffffc0000000000
R13: 1ffff1100eb0c820 R14: ffff88802dceca40 R15: ffff88802dcec010
FS:  0000000000000000(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20d7a7fc00 CR3: 000000004f9ac000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>