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 '10.128.0.40' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 43.244170] ------------[ cut here ]------------ [ 43.248946] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 43.257419] Kernel panic - not syncing: panic_on_warn set ... [ 43.257419] [ 43.264752] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.95-gee0bcd6 #3 [ 43.271556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.280879] ffff8801db307cc0 ffffffff81eb0f89 ffffffff83a484a0 00000000ffffffff [ 43.288852] 0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80 [ 43.296833] ffffffff8141f945 0000000041b58ab3 ffffffff841b7cf8 ffffffff8141f786 [ 43.304802] Call Trace: [ 43.307353] [ 43.309388] [] dump_stack+0xc1/0x128 [ 43.314738] [] panic+0x1bf/0x3bc [ 43.319724] [] ? add_taint.cold.6+0x16/0x16 [ 43.325664] [] ? __warn.cold.9+0xa6/0x17f [ 43.331429] [] ? inet_sock_destruct+0x598/0x760 [ 43.337714] [] __warn.cold.9+0xc1/0x17f [ 43.343322] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 43.349784] [] warn_slowpath_null+0x2c/0x40 [ 43.355723] [] inet_sock_destruct+0x598/0x760 [ 43.361835] [] ? ipv4_mib_init_net+0x570/0x570 [ 43.368036] [] l2tp_tunnel_destruct+0x339/0x590 [ 43.374332] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 43.380791] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 43.387254] [] __sk_destruct+0x55/0x590 [ 43.392849] [] rcu_process_callbacks+0x8ae/0x12b0 [ 43.399311] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 43.405958] [] ? sock_set_timeout+0x210/0x210 [ 43.412085] [] __do_softirq+0x20b/0x937 [ 43.417682] [] irq_exit+0x147/0x190 [ 43.422927] [] smp_apic_timer_interrupt+0x81/0xa0 [ 43.429386] [] apic_timer_interrupt+0xa0/0xb0 [ 43.435494] [ 43.437529] [] ? native_safe_halt+0x6/0x10 [ 43.443399] [] ? trace_hardirqs_on+0xd/0x10 [ 43.449338] [] default_idle+0x55/0x360 [ 43.454844] [] arch_cpu_idle+0x10/0x20 [ 43.460349] [] default_idle_call+0x45/0x60 [ 43.466201] [] cpu_startup_entry+0x2b5/0x380 [ 43.472225] [] ? cpu_in_idle+0x20/0x20 [ 43.477734] [] start_secondary+0x323/0x400 [ 43.483588] [] ? set_cpu_sibling_map+0x1300/0x1300 [ 43.490618] Dumping ftrace buffer: [ 43.494150] (ftrace buffer empty) [ 43.497833] Kernel Offset: disabled [ 43.501438] Rebooting in 86400 seconds..