[ 15.159118][ T5600] 8021q: adding VLAN 0 to HW filter on device bond0 [ 15.163900][ T5600] eql: remember to turn off Van-Jacobson compression on your slave devices [ 15.221055][ T40] gvnic 0000:00:00.0 enp0s0: Device link is up. [ 15.225181][ T1557] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s0: link becomes ready Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.135' (ECDSA) to the list of known hosts. syzkaller login: [ 36.474351][ T48] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 36.477110][ T5927] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 36.479213][ T5927] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 36.482466][ T5927] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 36.484559][ T5927] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 36.486372][ T5927] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 executing program [ 36.519342][ T5927] [ 36.519949][ T5927] ===================================== [ 36.521303][ T5927] WARNING: bad unlock balance detected! [ 36.522653][ T5927] 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted [ 36.524199][ T5927] ------------------------------------- [ 36.525510][ T5927] kworker/u5:2/5927 is trying to release lock (&conn->chan_lock) at: [ 36.527392][ T5927] [] l2cap_disconnect_rsp+0x210/0x30c [ 36.529029][ T5927] but there are no more locks to release! [ 36.530462][ T5927] [ 36.530462][ T5927] other info that might help us debug this: [ 36.532395][ T5927] 2 locks held by kworker/u5:2/5927: [ 36.533635][ T5927] #0: ffff0000dae9b138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 [ 36.536152][ T5927] #1: ffff80001e517c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 [ 36.538908][ T5927] [ 36.538908][ T5927] stack backtrace: [ 36.540243][ T5927] CPU: 1 PID: 5927 Comm: kworker/u5:2 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 [ 36.542624][ T5927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 [ 36.545138][ T5927] Workqueue: hci0 hci_rx_work [ 36.546222][ T5927] Call trace: [ 36.546997][ T5927] dump_backtrace+0x1b8/0x1e4 [ 36.548060][ T5927] show_stack+0x2c/0x44 [ 36.549036][ T5927] dump_stack_lvl+0xd0/0x124 [ 36.550127][ T5927] dump_stack+0x1c/0x28 [ 36.551139][ T5927] print_unlock_imbalance_bug+0x250/0x2a4 [ 36.552474][ T5927] lock_release+0x4ac/0x9ac [ 36.553515][ T5927] __mutex_unlock_slowpath+0xe0/0x6b4 [ 36.554819][ T5927] mutex_unlock+0x18/0x24 [ 36.555852][ T5927] l2cap_disconnect_rsp+0x210/0x30c [ 36.557127][ T5927] l2cap_bredr_sig_cmd+0x974/0x7e94 [ 36.558363][ T5927] l2cap_recv_frame+0x83c/0x6a14 [ 36.559572][ T5927] l2cap_recv_acldata+0x4f4/0x163c [ 36.560810][ T5927] hci_rx_work+0x2cc/0x8b8 [ 36.561845][ T5927] process_one_work+0x788/0x12d4 [ 36.563148][ T5927] worker_thread+0x8e0/0xfe8 [ 36.564191][ T5927] kthread+0x250/0x2d8 [ 36.565118][ T5927] ret_from_fork+0x10/0x20