------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:634 at hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:634, CPU#0: kworker/u11:3/13353
Modules linked in:
CPU: 0 UID: 0 PID: 13353 Comm: kworker/u11:3 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: hci1 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:634
Code: 44 0f b6 2d 2b 12 53 06 31 ff 41 83 e5 40 44 89 ee e8 9a 1c 88 f7 45 84 ed 0f 84 02 ff ff ff e9 c6 56 f1 f6 e8 37 22 88 f7 90 <0f> 0b 90 e8 2e 22 88 f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc900034afc10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805bde8a40 RCX: ffffffff8a7fda2f
RDX: ffff88805df99f00 RSI: ffffffff8a7fdb29 RDI: ffff88805df99f00
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff88805bde8000
R13: 0000000000000000 R14: ffff88805df9a3c4 R15: ffff888033e66400
FS:  0000000000000000(0000) GS:ffff88812438e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34ab0ff8 CR3: 000000006e6fe000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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>