INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 26.021717] ------------[ cut here ]------------ [ 26.026531] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 26.035044] Kernel panic - not syncing: panic_on_warn set ... [ 26.035044] [ 26.042482] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.94-g8683408 #3 [ 26.049297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.058731] ffff8801db207cc0 ffffffff81d9b509 ffffffff83a484a0 00000000ffffffff [ 26.066762] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 26.074785] ffffffff8141f845 0000000041b58ab3 ffffffff8419c168 ffffffff8141f686 [ 26.082833] Call Trace: [ 26.085391] [ 26.087439] [] dump_stack+0xc1/0x128 [ 26.092809] [] panic+0x1bf/0x3bc [ 26.097801] [] ? add_taint.cold.6+0x16/0x16 [ 26.103754] [] ? __warn.cold.9+0xa6/0x17f [ 26.109547] [] ? inet_sock_destruct+0x598/0x760 [ 26.115843] [] __warn.cold.9+0xc1/0x17f [ 26.121457] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 26.127926] [] warn_slowpath_null+0x2c/0x40 [ 26.133971] [] inet_sock_destruct+0x598/0x760 [ 26.140289] [] ? ipv4_mib_init_net+0x570/0x570 [ 26.147134] [] l2tp_tunnel_destruct+0x339/0x590 [ 26.153433] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 26.159910] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 26.166379] [] __sk_destruct+0x55/0x590 [ 26.171981] [] rcu_process_callbacks+0x8ae/0x12b0 [ 26.178448] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 26.185089] [] ? sock_set_timeout+0x210/0x210 [ 26.191220] [] __do_softirq+0x20b/0x937 [ 26.196843] [] irq_exit+0x147/0x190 [ 26.202191] [] smp_apic_timer_interrupt+0x81/0xa0 [ 26.208675] [] apic_timer_interrupt+0xa0/0xb0 [ 26.214792] [ 26.216833] [] ? native_safe_halt+0x6/0x10 [ 26.222713] [] default_idle+0x55/0x360 [ 26.228231] [] arch_cpu_idle+0x10/0x20 [ 26.233746] [] default_idle_call+0x45/0x60 [ 26.239616] [] cpu_startup_entry+0x2b5/0x380 [ 26.245656] [] ? cpu_in_idle+0x20/0x20 [ 26.251265] [] rest_init+0x183/0x189 [ 26.256611] [] start_kernel+0x67e/0x6b2 [ 26.262229] [] ? thread_stack_cache_init+0xb/0xb [ 26.268631] [] ? x86_family+0x32/0x40 [ 26.274232] [] ? early_idt_handler_array+0x120/0x120 [ 26.280968] [] x86_64_start_reservations+0x29/0x2b [ 26.287533] [] x86_64_start_kernel+0x13f/0x162 [ 26.294399] Dumping ftrace buffer: [ 26.297992] (ftrace buffer empty) [ 26.301678] Kernel Offset: disabled [ 26.305295] Rebooting in 86400 seconds..