[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.123' (ECDSA) to the list of known hosts. syzkaller login: [ 45.784853][ T6824] IPVS: ftp: loaded support on port[0] = 21 executing program [ 45.870076][ T6824] INFO: trying to register non-static key. [ 45.876164][ T6824] the code is fine but needs lockdep annotation. [ 45.882511][ T6824] turning off the locking correctness validator. [ 45.888815][ T6824] CPU: 1 PID: 6824 Comm: syz-executor971 Not tainted 5.9.0-rc4-syzkaller #0 [ 45.897472][ T6824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.907628][ T6824] Call Trace: [ 45.910894][ T6824] dump_stack+0x1d6/0x29e [ 45.915195][ T6824] register_lock_class+0xf06/0x1520 [ 45.920364][ T6824] ? update_curr+0x91/0xd30 [ 45.924886][ T6824] ? lock_is_held_type+0xb3/0xe0 [ 45.929795][ T6824] __lock_acquire+0xfd/0x2ae0 [ 45.934445][ T6824] ? trace_lock_release+0x149/0x1a0 [ 45.939614][ T6824] ? try_to_wake_up+0x896/0xbb0 [ 45.945700][ T6824] ? lock_is_held_type+0xb3/0xe0 [ 45.950605][ T6824] ? mark_lock+0x102/0x1b00 [ 45.955077][ T6824] ? lock_is_held_type+0xb3/0xe0 [ 45.960094][ T6824] ? rcu_read_lock_sched_held+0x2f/0xa0 [ 45.965872][ T6824] lock_acquire+0x140/0x6f0 [ 45.970358][ T6824] ? skb_queue_purge+0x2e/0x1c0 [ 45.976069][ T6824] ? check_preemption_disabled+0x51/0x140 [ 45.981901][ T6824] ? _raw_spin_lock_irqsave+0x84/0xd0 [ 45.987300][ T6824] _raw_spin_lock_irqsave+0xaa/0xd0 [ 45.992497][ T6824] ? skb_queue_purge+0x2e/0x1c0 [ 45.997331][ T6824] skb_queue_purge+0x2e/0x1c0 [ 46.001980][ T6824] l2cap_conn_del+0x3de/0x650 [ 46.007234][ T6824] ? l2cap_connect_cfm+0x12b0/0x12b0 [ 46.012499][ T6824] hci_conn_hash_flush+0x127/0x200 [ 46.017595][ T6824] hci_dev_do_close+0xb7b/0x1040 [ 46.022523][ T6824] hci_unregister_dev+0x185/0x1590 [ 46.027651][ T6824] vhci_release+0x73/0xc0 [ 46.031985][ T6824] ? vhci_open+0x290/0x290 [ 46.036400][ T6824] __fput+0x34f/0x7b0 [ 46.040358][ T6824] task_work_run+0x137/0x1c0 [ 46.044939][ T6824] do_exit+0x5f3/0x1f20 [ 46.049080][ T6824] ? vfs_write+0x787/0xd10 [ 46.054500][ T6824] ? lock_is_held_type+0xb3/0xe0 [ 46.059422][ T6824] do_group_exit+0x161/0x2d0 [ 46.063996][ T6824] __do_sys_exit_group+0x13/0x20 [ 46.069090][ T6824] __se_sys_exit_group+0x10/0x10 [ 46.074014][ T6824] __x64_sys_exit_group+0x37/0x40 [ 46.079037][ T6824] do_syscall_64+0x31/0x70 [ 46.083434][ T6824] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.089412][ T6824] RIP: 0033:0x445068 [ 46.093281][ T6824] Code: Bad RIP value. [ 46.097416][ T6824] RSP: 002b:00007ffde54928f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 46.105820][ T6824] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000445068 [ 46.113764][ T6824] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 4