[ 15.528772][ T3893] 8021q: adding VLAN 0 to HW filter on device bond0 [ 15.539203][ T3893] eql: remember to turn off Van-Jacobson compression on your slave devices [ 15.582209][ T489] gvnic 0000:00:00.0 enp0s0: Device link is up. [ 15.585033][ T24] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s0: link becomes ready Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. syzkaller login: [ 36.486254][ T4223] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 36.489355][ T4223] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 36.491682][ T4223] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 36.494957][ T4223] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 36.497401][ T4223] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 36.500722][ T4223] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 executing program [ 36.540378][ T4223] [ 36.541174][ T4223] ===================================== [ 36.542719][ T4223] WARNING: bad unlock balance detected! [ 36.544240][ T4223] 6.1.26-syzkaller #0 Not tainted [ 36.545678][ T4223] ------------------------------------- [ 36.547138][ T4223] kworker/u5:2/4223 is trying to release lock (&conn->chan_lock) at: [ 36.549438][ T4223] [] l2cap_disconnect_rsp+0x210/0x30c [ 36.551434][ T4223] but there are no more locks to release! [ 36.553072][ T4223] [ 36.553072][ T4223] other info that might help us debug this: [ 36.555348][ T4223] 2 locks held by kworker/u5:2/4223: [ 36.556830][ T4223] #0: ffff0000d5524938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 [ 36.559734][ T4223] #1: ffff80001d9f7c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 [ 36.562948][ T4223] [ 36.562948][ T4223] stack backtrace: [ 36.564553][ T4223] CPU: 0 PID: 4223 Comm: kworker/u5:2 Not tainted 6.1.26-syzkaller #0 [ 36.566769][ T4223] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 [ 36.569545][ T4223] Workqueue: hci0 hci_rx_work [ 36.570839][ T4223] Call trace: [ 36.571736][ T4223] dump_backtrace+0x1c8/0x1f4 [ 36.573007][ T4223] show_stack+0x2c/0x3c [ 36.574178][ T4223] dump_stack_lvl+0x108/0x170 [ 36.575470][ T4223] dump_stack+0x1c/0x5c [ 36.576586][ T4223] print_unlock_imbalance_bug+0x250/0x2a4 [ 36.578166][ T4223] lock_release+0x4dc/0xa50 [ 36.579417][ T4223] __mutex_unlock_slowpath+0xe0/0x6cc [ 36.580915][ T4223] mutex_unlock+0x24/0x30 [ 36.582122][ T4223] l2cap_disconnect_rsp+0x210/0x30c [ 36.583550][ T4223] l2cap_bredr_sig_cmd+0x974/0x7e94 [ 36.585001][ T4223] l2cap_recv_frame+0x83c/0x6a14 [ 36.586380][ T4223] l2cap_recv_acldata+0x4f4/0x163c [ 36.587805][ T4223] hci_rx_work+0x2cc/0x8b8 [ 36.589028][ T4223] process_one_work+0x7ac/0x1404 [ 36.590369][ T4223] worker_thread+0x8e4/0xfec [ 36.591724][ T4223] kthread+0x250/0x2d8 [ 36.592856][ T4223] ret_from_fork+0x10/0x20