[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.138' (ECDSA) to the list of known hosts. syzkaller login: [ 62.294509][ T6851] IPVS: ftp: loaded support on port[0] = 21 executing program [ 62.383546][ T6851] INFO: trying to register non-static key. [ 62.389372][ T6851] the code is fine but needs lockdep annotation. [ 62.395727][ T6851] turning off the locking correctness validator. [ 62.402079][ T6851] CPU: 1 PID: 6851 Comm: syz-executor876 Not tainted 5.9.0-rc2-syzkaller #0 [ 62.410908][ T6851] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.420996][ T6851] Call Trace: [ 62.424318][ T6851] dump_stack+0x18f/0x20d [ 62.428624][ T6851] register_lock_class+0x157d/0x1630 [ 62.433883][ T6851] ? lock_is_held_type+0xbb/0xf0 [ 62.438796][ T6851] ? is_dynamic_key+0x1a0/0x1a0 [ 62.443623][ T6851] ? find_held_lock+0x2d/0x110 [ 62.448359][ T6851] ? try_to_wake_up+0x57e/0x12b0 [ 62.453275][ T6851] __lock_acquire+0xf9/0x5640 [ 62.457952][ T6851] ? lockdep_hardirqs_off+0x89/0xc0 [ 62.463198][ T6851] ? trace_hardirqs_off+0x27/0x210 [ 62.468309][ T6851] ? __queue_work+0x61a/0xf20 [ 62.472976][ T6851] ? preempt_schedule_notrace_thunk+0x16/0x31 [ 62.479027][ T6851] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 62.484984][ T6851] ? find_held_lock+0x2d/0x110 [ 62.489775][ T6851] ? __queue_work+0x61a/0xf20 [ 62.494479][ T6851] lock_acquire+0x1f1/0xad0 [ 62.499045][ T6851] ? skb_dequeue+0x1c/0x180 [ 62.503525][ T6851] ? lock_release+0x8e0/0x8e0 [ 62.508175][ T6851] ? mark_lock+0xbc/0x1710 [ 62.512567][ T6851] ? __queue_work+0x63c/0xf20 [ 62.517220][ T6851] ? mark_held_locks+0x9f/0xe0 [ 62.521989][ T6851] _raw_spin_lock_irqsave+0x8c/0xc0 [ 62.527164][ T6851] ? skb_dequeue+0x1c/0x180 [ 62.531645][ T6851] skb_dequeue+0x1c/0x180 [ 62.535948][ T6851] skb_queue_purge+0x21/0x30 [ 62.540512][ T6851] l2cap_chan_del+0x61d/0x1300 [ 62.545279][ T6851] l2cap_conn_del+0x46a/0x9e0 [ 62.549932][ T6851] ? l2cap_conn_del+0x9e0/0x9e0 [ 62.554755][ T6851] l2cap_disconn_cfm+0x85/0xa0 [ 62.559513][ T6851] hci_conn_hash_flush+0x114/0x220 [ 62.564601][ T6851] hci_dev_do_close+0x5c6/0x1080 [ 62.569543][ T6851] ? hci_dev_open+0x350/0x350 [ 62.574216][ T6851] ? do_raw_read_unlock+0x70/0x70 [ 62.579214][ T6851] ? try_to_grab_pending.part.0+0x7d0/0x7d0 [ 62.585183][ T6851] hci_unregister_dev+0x1bd/0xe30 [ 62.590197][ T6851] ? fcntl_setlk+0xf60/0xf60 [ 62.594777][ T6851] ? lock_is_held_type+0xbb/0xf0 [ 62.599777][ T6851] vhci_release+0x70/0xe0 [ 62.604081][ T6851] __fput+0x285/0x920 [ 62.608059][ T6851] ? vhci_close_dev+0x50/0x50 [ 62.612709][ T6851] task_work_run+0xdd/0x190 [ 62.617187][ T6851] do_exit+0xb7d/0x29f0 [ 62.621324][ T6851] ? mm_update_next_owner+0x7a0/0x7a0 [ 62.628317][ T6851] ? __sb_end_write+0xf8/0x1d0 [ 62.633058][ T6851] ? lock_is_held_type+0xbb/0xf0 [ 62.637997][ T6851] ? lock_is_held_type+0xbb/0xf0 [ 62.642929][ T6851] do_group_exit+0x125/0x310 [ 62.647491][ T6851] __x64_sys_exit_group+0x3a/0x50 [ 62.652514][ T6851] do_syscall_64+0x2d/0x70 [ 62.656906][ T6851] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 62.663901][ T6851] RIP: 0033:0x445068 [ 62.667778][ T6851] Code: Bad RIP value. [ 62.671817][ T6851] RSP: 002b:00007ffcfca42688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 62.680299][ T6851] RAX: ffffffffffffffda RBX: 0000