INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
syzkaller login: [   27.107499] ------------[ cut here ]------------
[   27.112312] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   27.120789] Kernel panic - not syncing: panic_on_warn set ...
[   27.120789] 
[   27.128121] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.94-g8683408 #3
[   27.134928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.144257]  ffff8801db207cc0 ffffffff81d9b509 ffffffff83a484a0 00000000ffffffff
[   27.152239]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   27.160218]  ffffffff8141f845 0000000041b58ab3 ffffffff8419c168 ffffffff8141f686
[   27.168198] Call Trace:
[   27.170752]  <IRQ> [   27.172790]  [<ffffffff81d9b509>] dump_stack+0xc1/0x128
[   27.178145]  [<ffffffff8141f845>] panic+0x1bf/0x3bc
[   27.183132]  [<ffffffff8141f686>] ? add_taint.cold.6+0x16/0x16
[   27.189074]  [<ffffffff8141fb16>] ? __warn.cold.9+0xa6/0x17f
[   27.194842]  [<ffffffff832fcc28>] ? inet_sock_destruct+0x598/0x760
[   27.201127]  [<ffffffff8141fb31>] __warn.cold.9+0xc1/0x17f
[   27.206722]  [<ffffffff83594bef>] ? l2tp_tunnel_closeall+0x2af/0x350
[   27.213189]  [<ffffffff8113461c>] warn_slowpath_null+0x2c/0x40
[   27.219130]  [<ffffffff832fcc28>] inet_sock_destruct+0x598/0x760
[   27.225254]  [<ffffffff832fc690>] ? ipv4_mib_init_net+0x570/0x570
[   27.231459]  [<ffffffff83595439>] l2tp_tunnel_destruct+0x339/0x590
[   27.237747]  [<ffffffff835952aa>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   27.244209]  [<ffffffff83595100>] ? l2tp_tunnel_del_work+0x470/0x470
[   27.250676]  [<ffffffff82efa095>] __sk_destruct+0x55/0x590
[   27.256270]  [<ffffffff8128575e>] rcu_process_callbacks+0x8ae/0x12b0
[   27.262733]  [<ffffffff8128583e>] ? rcu_process_callbacks+0x98e/0x12b0
[   27.269370]  [<ffffffff82efa040>] ? sock_set_timeout+0x210/0x210
[   27.275485]  [<ffffffff838d7efb>] __do_softirq+0x20b/0x937
[   27.281080]  [<ffffffff81149037>] irq_exit+0x147/0x190
[   27.286326]  [<ffffffff838d6ae1>] smp_apic_timer_interrupt+0x81/0xa0
[   27.292786]  [<ffffffff838d2c70>] apic_timer_interrupt+0xa0/0xb0
[   27.298897]  <EOI> [   27.300932]  [<ffffffff838cff16>] ? native_safe_halt+0x6/0x10
[   27.306804]  [<ffffffff838cf555>] default_idle+0x55/0x360
[   27.312314]  [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20
[   27.317821]  [<ffffffff838d0375>] default_idle_call+0x45/0x60
[   27.323677]  [<ffffffff81220e35>] cpu_startup_entry+0x2b5/0x380
[   27.329705]  [<ffffffff81220b80>] ? cpu_in_idle+0x20/0x20
[   27.335218]  [<ffffffff838bd1dc>] rest_init+0x183/0x189
[   27.340561]  [<ffffffff84a73943>] start_kernel+0x67e/0x6b2
[   27.346155]  [<ffffffff84a732c5>] ? thread_stack_cache_init+0xb/0xb
[   27.352530]  [<ffffffff81dca0f2>] ? x86_family+0x32/0x40
[   27.357948]  [<ffffffff84a72120>] ? early_idt_handler_array+0x120/0x120
[   27.364670]  [<ffffffff84a7229a>] x86_64_start_reservations+0x29/0x2b
[   27.371219]  [<ffffffff84a723db>] x86_64_start_kernel+0x13f/0x162
[   27.377933] Dumping ftrace buffer:
[   27.381469]    (ftrace buffer empty)
[   27.385151] Kernel Offset: disabled
[   27.388759] Rebooting in 86400 seconds..