[....] 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[ 13.977317] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.021123] random: sshd: uninitialized urandom read (32 bytes read) [ 22.289537] random: sshd: uninitialized urandom read (32 bytes read) [ 22.802298] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 28.488495] urandom_read: 1 callbacks suppressed [ 28.488499] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 28.730910] ------------[ cut here ]------------ [ 28.735703] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 28.744220] Kernel panic - not syncing: panic_on_warn set ... [ 28.744220] [ 28.751676] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.122-g54068d6 #78 [ 28.758736] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.768090] ffff8801db207cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff [ 28.776253] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 28.784454] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 28.792661] Call Trace: [ 28.795300] [ 28.797434] [] dump_stack+0xc1/0x128 [ 28.802817] [] panic+0x1bf/0x3bc [ 28.807838] [] ? add_taint.cold.6+0x16/0x16 [ 28.813798] [] ? __warn.cold.9+0xa6/0x17f [ 28.819587] [] ? inet_sock_destruct+0x598/0x760 [ 28.825981] [] __warn.cold.9+0xc1/0x17f [ 28.831594] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 28.838077] [] warn_slowpath_null+0x2c/0x40 [ 28.844040] [] inet_sock_destruct+0x598/0x760 [ 28.850172] [] ? ipv4_mib_init_net+0x570/0x570 [ 28.856611] [] l2tp_tunnel_destruct+0x339/0x590 [ 28.862930] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 28.869412] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 28.875898] [] __sk_destruct+0x55/0x590 [ 28.881510] [] rcu_process_callbacks+0x8ae/0x12b0 [ 28.888128] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 28.894788] [] ? sock_set_timeout+0x210/0x210 [ 28.900966] [] __do_softirq+0x210/0x940 [ 28.906591] [] irq_exit+0x114/0x150 [ 28.911852] [] smp_apic_timer_interrupt+0x81/0xa0 [ 28.918480] [] apic_timer_interrupt+0xa0/0xb0 [ 28.924726] [ 28.926778] [] ? native_safe_halt+0x6/0x10 [ 28.932668] [] default_idle+0x55/0x360 [ 28.938196] [] arch_cpu_idle+0x10/0x20 [ 28.943722] [] default_idle_call+0x45/0x60 [ 28.949595] [] cpu_startup_entry+0x2b5/0x380 [ 28.955644] [] ? cpu_in_idle+0x20/0x20 [ 28.961172] [] rest_init+0x183/0x189 [ 28.966524] [] start_kernel+0x67e/0x6b2 [ 28.972157] [] ? thread_stack_cache_init+0xb/0xb [ 28.978602] [] ? x86_family+0x32/0x40 [ 28.984043] [] ? early_idt_handler_array+0x120/0x120 [ 28.990788] [] x86_64_start_reservations+0x29/0x2b [ 28.997368] [] x86_64_start_kernel+0x13f/0x162 [ 29.004059] Dumping ftrace buffer: [ 29.007653] (ftrace buffer empty) [ 29.011445] Kernel Offset: disabled [ 29.015066] Rebooting in 86400 seconds..