Warning: Permanently added '10.128.1.26' (ECDSA) to the list of known hosts. syzkaller login: [ 34.203543][ T48] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 34.206144][ T48] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 34.208484][ T48] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 34.211875][ T48] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 34.214298][ T48] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 34.216372][ T48] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 executing program [ 34.251905][ T5503] [ 34.252559][ T5503] ===================================== [ 34.254107][ T5503] WARNING: bad unlock balance detected! [ 34.255602][ T5503] 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted [ 34.257425][ T5503] ------------------------------------- [ 34.258983][ T5503] kworker/u5:1/5503 is trying to release lock (&conn->chan_lock) at: [ 34.261241][ T5503] [] l2cap_disconnect_rsp+0x210/0x30c [ 34.263086][ T5503] but there are no more locks to release! [ 34.264646][ T5503] [ 34.264646][ T5503] other info that might help us debug this: [ 34.266861][ T5503] 2 locks held by kworker/u5:1/5503: [ 34.268281][ T5503] #0: ffff0000d5e93938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 [ 34.271114][ T5503] #1: ffff80001fea7c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 [ 34.274269][ T5503] [ 34.274269][ T5503] stack backtrace: [ 34.275877][ T5503] CPU: 0 PID: 5503 Comm: kworker/u5:1 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 [ 34.278555][ T5503] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 [ 34.281258][ T5503] Workqueue: hci0 hci_rx_work [ 34.282546][ T5503] Call trace: [ 34.283438][ T5503] dump_backtrace+0x1b8/0x1e4 [ 34.284753][ T5503] show_stack+0x2c/0x44 [ 34.285934][ T5503] dump_stack_lvl+0xd0/0x124 [ 34.287247][ T5503] dump_stack+0x1c/0x28 [ 34.288410][ T5503] print_unlock_imbalance_bug+0x250/0x2a4 [ 34.289952][ T5503] lock_release+0x4ac/0x9ac [ 34.291194][ T5503] __mutex_unlock_slowpath+0xe0/0x6b4 [ 34.292687][ T5503] mutex_unlock+0x18/0x24 [ 34.293878][ T5503] l2cap_disconnect_rsp+0x210/0x30c [ 34.295303][ T5503] l2cap_recv_frame+0x18b4/0x6a14 [ 34.296668][ T5503] l2cap_recv_acldata+0x4f4/0x163c [ 34.298057][ T5503] hci_rx_work+0x2cc/0x8b8 [ 34.299321][ T5503] process_one_work+0x788/0x12d4 [ 34.300670][ T5503] worker_thread+0x8e0/0xfe8 [ 34.302006][ T5503] kthread+0x250/0x2d8 [ 34.303133][ T5503] ret_from_fork+0x10/0x20