[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ 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 '10.128.10.12' (ECDSA) to the list of known hosts. syzkaller login: [ 61.536531][ T6859] IPVS: ftp: loaded support on port[0] = 21 executing program [ 61.658678][ T6859] INFO: trying to register non-static key. [ 61.664560][ T6859] the code is fine but needs lockdep annotation. [ 61.670900][ T6859] turning off the locking correctness validator. [ 61.677201][ T6859] CPU: 1 PID: 6859 Comm: syz-executor637 Not tainted 5.9.0-rc2-syzkaller #0 [ 61.685846][ T6859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.695873][ T6859] Call Trace: [ 61.699168][ T6859] dump_stack+0x18f/0x20d [ 61.703564][ T6859] register_lock_class+0x157d/0x1630 [ 61.708852][ T6859] ? lock_acquire+0x1f1/0xad0 [ 61.713504][ T6859] ? find_held_lock+0x2d/0x110 [ 61.718241][ T6859] ? is_dynamic_key+0x1a0/0x1a0 [ 61.723079][ T6859] __lock_acquire+0xf9/0x5640 [ 61.727731][ T6859] ? trace_hardirqs_on+0x5f/0x220 [ 61.732750][ T6859] ? _raw_spin_unlock_irq+0x55/0x80 [ 61.737943][ T6859] ? finish_task_switch+0x147/0x750 [ 61.743134][ T6859] ? finish_task_switch+0x119/0x750 [ 61.748313][ T6859] ? __switch_to+0x425/0xfe0 [ 61.752903][ T6859] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 61.758873][ T6859] ? __schedule+0x8ed/0x21e0 [ 61.763439][ T6859] ? mark_lock+0xbc/0x1710 [ 61.767851][ T6859] lock_acquire+0x1f1/0xad0 [ 61.772374][ T6859] ? skb_dequeue+0x1c/0x180 [ 61.776857][ T6859] ? lock_release+0x8e0/0x8e0 [ 61.781522][ T6859] ? trace_hardirqs_on+0x5f/0x220 [ 61.786569][ T6859] ? lockdep_hardirqs_on+0x76/0xf0 [ 61.791672][ T6859] ? asm_sysvec_reschedule_ipi+0x12/0x20 [ 61.797300][ T6859] _raw_spin_lock_irqsave+0x8c/0xc0 [ 61.802476][ T6859] ? skb_dequeue+0x1c/0x180 [ 61.806953][ T6859] skb_dequeue+0x1c/0x180 [ 61.811255][ T6859] skb_queue_purge+0x21/0x30 [ 61.815821][ T6859] l2cap_chan_del+0x61d/0x1300 [ 61.820559][ T6859] l2cap_conn_del+0x46a/0x9e0 [ 61.825215][ T6859] ? l2cap_conn_del+0x9e0/0x9e0 [ 61.830049][ T6859] l2cap_disconn_cfm+0x85/0xa0 [ 61.834797][ T6859] hci_conn_hash_flush+0x114/0x220 [ 61.839881][ T6859] hci_dev_do_close+0x5c6/0x1080 [ 61.844792][ T6859] ? hci_dev_open+0x350/0x350 [ 61.849441][ T6859] ? do_raw_read_unlock+0x70/0x70 [ 61.854440][ T6859] ? try_to_grab_pending.part.0+0x7d0/0x7d0 [ 61.860302][ T6859] hci_unregister_dev+0x1bd/0xe30 [ 61.865299][ T6859] ? fcntl_setlk+0xf60/0xf60 [ 61.869863][ T6859] ? lock_is_held_type+0xbb/0xf0 [ 61.874776][ T6859] vhci_release+0x70/0xe0 [ 61.879108][ T6859] __fput+0x285/0x920 [ 61.883069][ T6859] ? vhci_close_dev+0x50/0x50 [ 61.887744][ T6859] task_work_run+0xdd/0x190 [ 61.892235][ T6859] do_exit+0xb7d/0x29f0 [ 61.896370][ T6859] ? mm_update_next_owner+0x7a0/0x7a0 [ 61.901736][ T6859] ? __sb_end_write+0xf8/0x1d0 [ 61.906477][ T6859] ? vfs_write+0x1b0/0x730 [ 61.910884][ T6859] ? lock_is_held_type+0xbb/0xf0 [ 61.915814][ T6859] do_group_exit+0x125/0x310 [ 61.920376][ T6859] __x64_sys_exit_group+0x3a/0x50 [ 61.925376][ T6859] do_syscall_64+0x2d/0x70 [ 61.929767][ T6859] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.935636][ T6859] RIP: 0033:0x445068 [ 61.939498][ T6859] Code: Bad RIP value. [ 61.943535][ T6859] RSP: 002b:00007ffd018d60c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 61.951968][ T6859] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000445068 [