Bluetooth: hci4: unexpected event 0x06 length: 4 > 3
Bluetooth: hci4: command 0x0406 tx timeout
------------[ cut here ]------------
refcnt < 0
WARNING: net/bluetooth/hci_conn.c:567 at hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:567, CPU#0: kworker/u9:7/5820
Modules linked in:
CPU: 0 UID: 0 PID: 5820 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 01/24/2026
Workqueue: hci4 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:567
Code: 44 0f b6 2d ab 68 3d 06 31 ff 41 83 e5 40 44 89 ee e8 6a 31 91 f7 45 84 ed 0f 84 02 ff ff ff e9 ac 93 fb f6 e8 07 37 91 f7 90 <0f> 0b 90 e8 fe 36 91 f7 48 8d bb fd f5 ff ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000417fc20 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888033560a40 RCX: ffffffff8a760d1f
RDX: ffff88807b658000 RSI: ffffffff8a760e19 RDI: ffff88807b658000
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff888033560000
R13: ffff88807b658484 R14: 0000000000000000 R15: ffff88801dfd3000
FS:  0000000000000000(0000) GS:ffff8881245b3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78185e96c0 CR3: 000000000e396000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
 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>