------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:634 at hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:634, CPU#0: kworker/u9:2/6783
Modules linked in:
CPU: 0 UID: 0 PID: 6783 Comm: kworker/u9:2 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: hci5 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xff/0x2c0 net/bluetooth/hci_conn.c:634
Code: 48 89 df e8 83 af 09 00 eb 07 e8 bc d2 2a f7 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 e7 9f fe ff e8 a2 d2 2a 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: 0000:ffffc900178bfad0 EFLAGS: 00010293
RAX: ffffffff8a9b237e RBX: ffff88802d42c000 RCX: ffff888037731f00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88802d42c013 R09: 1ffff11005a85802
R10: dffffc0000000000 R11: ffffed1005a85803 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88802d42ca40 R15: ffff88802d42c010
FS:  0000000000000000(0000) GS:ffff88812528f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f54334d8 CR3: 0000000079166000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>