Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts. syzkaller login: [ 34.587623][ T5929] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 34.590345][ T5929] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 34.592357][ T5929] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 34.594798][ T5929] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 34.596884][ T5929] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 34.598774][ T5929] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 [ 34.633452][ T5929] [ 34.634069][ T5929] ===================================== [ 34.635413][ T5929] WARNING: bad unlock balance detected! [ 34.636776][ T5929] 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted [ 34.638383][ T5929] ------------------------------------- executing program [ 34.639692][ T5929] kworker/u5:2/5929 is trying to release lock (&conn->chan_lock) at: [ 34.641724][ T5929] [] l2cap_disconnect_rsp+0x210/0x30c [ 34.643427][ T5929] but there are no more locks to release! [ 34.644882][ T5929] [ 34.644882][ T5929] other info that might help us debug this: [ 34.646817][ T5929] 2 locks held by kworker/u5:2/5929: [ 34.648124][ T5929] #0: ffff0000d5dbf938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 [ 34.650688][ T5929] #1: ffff80001e4f7c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 [ 34.653534][ T5929] [ 34.653534][ T5929] stack backtrace: [ 34.654923][ T5929] CPU: 0 PID: 5929 Comm: kworker/u5:2 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 [ 34.657282][ T5929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 [ 34.659764][ T5929] Workqueue: hci0 hci_rx_work [ 34.660926][ T5929] Call trace: [ 34.661736][ T5929] dump_backtrace+0x1b8/0x1e4 [ 34.662874][ T5929] show_stack+0x2c/0x44 [ 34.663908][ T5929] dump_stack_lvl+0xd0/0x124 [ 34.665010][ T5929] dump_stack+0x1c/0x28 [ 34.666048][ T5929] print_unlock_imbalance_bug+0x250/0x2a4 [ 34.667444][ T5929] lock_release+0x4ac/0x9ac [ 34.668616][ T5929] __mutex_unlock_slowpath+0xe0/0x6b4 [ 34.669964][ T5929] mutex_unlock+0x18/0x24 [ 34.671044][ T5929] l2cap_disconnect_rsp+0x210/0x30c [ 34.672316][ T5929] l2cap_recv_frame+0x18b4/0x6a14 [ 34.673621][ T5929] l2cap_recv_acldata+0x4f4/0x163c [ 34.674894][ T5929] hci_rx_work+0x2cc/0x8b8 [ 34.675990][ T5929] process_one_work+0x788/0x12d4 [ 34.677236][ T5929] worker_thread+0x8e0/0xfe8 [ 34.678368][ T5929] kthread+0x250/0x2d8 [ 34.679299][ T5929] ret_from_fork+0x10/0x20