[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.619390] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 14.990841] random: sshd: uninitialized urandom read (32 bytes read) [ 15.200537] random: sshd: uninitialized urandom read (32 bytes read) [ 15.695210] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.858469] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 21.358765] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 21.576695] ------------[ cut here ]------------ [ 21.581482] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 21.589964] Kernel panic - not syncing: panic_on_warn set ... [ 21.589964] [ 21.597326] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.123-g8dd3fc2 #31 [ 21.604312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.613663] ffff8801db207cc0 ffffffff81eb9689 ffffffff83c48ac0 00000000ffffffff [ 21.621661] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 21.629653] ffffffff81423f75 0000000041b58ab3 ffffffff843bb878 ffffffff81423db6 [ 21.637694] Call Trace: [ 21.640252] [ 21.642292] [] dump_stack+0xc1/0x128 [ 21.647664] [] panic+0x1bf/0x3bc [ 21.652656] [] ? add_taint.cold.6+0x16/0x16 [ 21.658603] [] ? __warn.cold.9+0xa6/0x17f [ 21.664385] [] ? inet_sock_destruct+0x598/0x760 [ 21.670789] [] __warn.cold.9+0xc1/0x17f [ 21.676389] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 21.682856] [] warn_slowpath_null+0x2c/0x40 [ 21.688804] [] inet_sock_destruct+0x598/0x760 [ 21.694924] [] ? ipv4_mib_init_net+0x570/0x570 [ 21.701132] [] l2tp_tunnel_destruct+0x339/0x590 [ 21.707427] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 21.713901] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 21.720394] [] __sk_destruct+0x55/0x590 [ 21.726003] [] rcu_process_callbacks+0x8ae/0x12b0 [ 21.732685] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 21.739329] [] ? sock_set_timeout+0x210/0x210 [ 21.745451] [] __do_softirq+0x210/0x940 [ 21.751054] [] irq_exit+0x114/0x150 [ 21.756306] [] smp_apic_timer_interrupt+0x81/0xa0 [ 21.762776] [] apic_timer_interrupt+0xa0/0xb0 [ 21.768892] [ 21.770953] [] ? native_safe_halt+0x6/0x10 [ 21.776840] [] default_idle+0x55/0x360 [ 21.782353] [] arch_cpu_idle+0x10/0x20 [ 21.787865] [] default_idle_call+0x45/0x60 [ 21.793739] [] cpu_startup_entry+0x2b5/0x380 [ 21.799778] [] ? cpu_in_idle+0x20/0x20 [ 21.805300] [] rest_init+0x183/0x189 [ 21.810660] [] start_kernel+0x67e/0x6b2 [ 21.816268] [] ? thread_stack_cache_init+0xb/0xb [ 21.822658] [] ? x86_family+0x32/0x40 [ 21.828086] [] ? early_idt_handler_array+0x120/0x120 [ 21.834812] [] x86_64_start_reservations+0x29/0x2b [ 21.841374] [] x86_64_start_kernel+0x13f/0x162 [ 21.848041] Dumping ftrace buffer: [ 21.851606] (ftrace buffer empty) [ 21.855292] Kernel Offset: disabled [ 21.858899] Rebooting in 86400 seconds..