Warning: Permanently added '10.128.0.107' (ECDSA) to the list of known hosts. [ 43.060744][ T4228] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 43.063130][ T4228] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 43.065426][ T4228] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 43.067966][ T4228] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 43.070645][ T4228] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 43.072646][ T4228] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 executing program [ 43.109483][ T4228] [ 43.110061][ T4228] ===================================== [ 43.111471][ T4228] WARNING: bad unlock balance detected! [ 43.112826][ T4228] 6.1.26-syzkaller #0 Not tainted [ 43.114081][ T4228] ------------------------------------- [ 43.115482][ T4228] kworker/u5:2/4228 is trying to release lock (&conn->chan_lock) at: [ 43.117534][ T4228] [] l2cap_disconnect_rsp+0x210/0x30c [ 43.119282][ T4228] but there are no more locks to release! [ 43.120780][ T4228] [ 43.120780][ T4228] other info that might help us debug this: [ 43.122783][ T4228] 2 locks held by kworker/u5:2/4228: [ 43.124094][ T4228] #0: ffff0000d0f56138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 [ 43.126694][ T4228] #1: ffff80001da07c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 [ 43.129539][ T4228] [ 43.129539][ T4228] stack backtrace: [ 43.130917][ T4228] CPU: 1 PID: 4228 Comm: kworker/u5:2 Not tainted 6.1.26-syzkaller #0 [ 43.132853][ T4228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 [ 43.135385][ T4228] Workqueue: hci0 hci_rx_work [ 43.136567][ T4228] Call trace: [ 43.137356][ T4228] dump_backtrace+0x1c8/0x1f4 [ 43.138459][ T4228] show_stack+0x2c/0x3c [ 43.139477][ T4228] dump_stack_lvl+0x108/0x170 [ 43.140655][ T4228] dump_stack+0x1c/0x5c [ 43.141664][ T4228] print_unlock_imbalance_bug+0x250/0x2a4 [ 43.143049][ T4228] lock_release+0x4dc/0xa50 [ 43.144177][ T4228] __mutex_unlock_slowpath+0xe0/0x6cc [ 43.145610][ T4228] mutex_unlock+0x24/0x30 [ 43.146660][ T4228] l2cap_disconnect_rsp+0x210/0x30c [ 43.147909][ T4228] l2cap_recv_frame+0x18b4/0x6a14 [ 43.149108][ T4228] l2cap_recv_acldata+0x4f4/0x163c [ 43.150402][ T4228] hci_rx_work+0x2cc/0x8b8 [ 43.151490][ T4228] process_one_work+0x7ac/0x1404 [ 43.152627][ T4228] worker_thread+0x8e4/0xfec [ 43.153765][ T4228] kthread+0x250/0x2d8 [ 43.154773][ T4228] ret_from_fork+0x10/0x20