[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.110' (ECDSA) to the list of known hosts. syzkaller login: [ 61.216383][ T6845] IPVS: ftp: loaded support on port[0] = 21 executing program [ 61.324734][ T6845] INFO: trying to register non-static key. [ 61.330578][ T6845] the code is fine but needs lockdep annotation. [ 61.336903][ T6845] turning off the locking correctness validator. [ 61.343224][ T6845] CPU: 1 PID: 6845 Comm: syz-executor413 Not tainted 5.9.0-rc2-next-20200825-syzkaller #0 [ 61.353113][ T6845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.363207][ T6845] Call Trace: [ 61.366480][ T6845] dump_stack+0x18f/0x20d [ 61.370790][ T6845] register_lock_class+0x157d/0x1630 [ 61.376049][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 61.380991][ T6845] ? is_dynamic_key+0x1a0/0x1a0 [ 61.385822][ T6845] ? find_held_lock+0x2d/0x110 [ 61.390564][ T6845] ? try_to_wake_up+0x57e/0x12b0 [ 61.395475][ T6845] __lock_acquire+0xf9/0x5640 [ 61.400130][ T6845] ? lockdep_hardirqs_off+0x89/0xc0 [ 61.405334][ T6845] ? trace_hardirqs_off+0x27/0x210 [ 61.410436][ T6845] ? __queue_work+0x61a/0xf20 [ 61.415087][ T6845] ? preempt_schedule_notrace_thunk+0x16/0x31 [ 61.421142][ T6845] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 61.427094][ T6845] ? find_held_lock+0x2d/0x110 [ 61.431890][ T6845] ? __queue_work+0x61a/0xf20 [ 61.436540][ T6845] lock_acquire+0x1f1/0xad0 [ 61.441017][ T6845] ? skb_dequeue+0x1c/0x180 [ 61.445494][ T6845] ? lock_release+0x8e0/0x8e0 [ 61.450157][ T6845] ? mark_lock+0xbc/0x1710 [ 61.454572][ T6845] ? __queue_work+0x63c/0xf20 [ 61.459221][ T6845] ? mark_held_locks+0x9f/0xe0 [ 61.463990][ T6845] _raw_spin_lock_irqsave+0x8c/0xc0 [ 61.469161][ T6845] ? skb_dequeue+0x1c/0x180 [ 61.473637][ T6845] skb_dequeue+0x1c/0x180 [ 61.477951][ T6845] skb_queue_purge+0x21/0x30 [ 61.482520][ T6845] l2cap_chan_del+0x61d/0x1300 [ 61.487257][ T6845] l2cap_conn_del+0x46a/0x9e0 [ 61.491920][ T6845] ? l2cap_conn_del+0x9e0/0x9e0 [ 61.496750][ T6845] l2cap_disconn_cfm+0x85/0xa0 [ 61.501501][ T6845] hci_conn_hash_flush+0x114/0x220 [ 61.506583][ T6845] hci_dev_do_close+0x5c6/0x1080 [ 61.511513][ T6845] ? hci_dev_open+0x350/0x350 [ 61.516160][ T6845] ? do_raw_read_unlock+0x70/0x70 [ 61.521164][ T6845] ? try_to_grab_pending.part.0+0x7d0/0x7d0 [ 61.527030][ T6845] hci_unregister_dev+0x1bd/0xe30 [ 61.532043][ T6845] ? fcntl_setlk+0xf60/0xf60 [ 61.536624][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 61.541562][ T6845] vhci_release+0x70/0xe0 [ 61.545866][ T6845] __fput+0x285/0x920 [ 61.549821][ T6845] ? vhci_close_dev+0x50/0x50 [ 61.554472][ T6845] task_work_run+0xdd/0x190 [ 61.558991][ T6845] do_exit+0xb7d/0x29f0 [ 61.563122][ T6845] ? __mutex_unlock_slowpath+0xe2/0x610 [ 61.568641][ T6845] ? mm_update_next_owner+0x7a0/0x7a0 [ 61.573997][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 61.578921][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 61.583830][ T6845] do_group_exit+0x125/0x310 [ 61.588408][ T6845] __x64_sys_exit_group+0x3a/0x50 [ 61.593407][ T6845] do_syscall_64+0x2d/0x70 [ 61.597799][ T6845] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.603690][ T6845] RIP: 0033:0x445068 [ 61.607557][ T6845] Code: Bad RIP value. [ 61.611593][ T6845] RSP: 002b:00007fff08b7cd48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 61.619979][ T6845] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: