[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.478695] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.222146] random: sshd: uninitialized urandom read (32 bytes read) [ 15.489797] random: sshd: uninitialized urandom read (32 bytes read) [ 16.003024] random: sshd: uninitialized urandom read (32 bytes read) [ 16.832783] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 22.326934] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.451998] ------------[ cut here ]------------ [ 22.456818] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 22.465340] Kernel panic - not syncing: panic_on_warn set ... [ 22.465340] [ 22.472712] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.123-g8dd3fc2 #27 [ 22.479719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.489062] ffff8801db207cc0 ffffffff81eb9689 ffffffff83c48ac0 00000000ffffffff executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.497113] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 22.505141] ffffffff81423f75 0000000041b58ab3 ffffffff843bb878 ffffffff81423db6 [ 22.513216] Call Trace: [ 22.515785] [ 22.517844] [] dump_stack+0xc1/0x128 [ 22.523250] [] panic+0x1bf/0x3bc [ 22.528264] [] ? add_taint.cold.6+0x16/0x16 [ 22.534221] [] ? __warn.cold.9+0xa6/0x17f [ 22.540018] [] ? inet_sock_destruct+0x598/0x760 [ 22.546331] [] __warn.cold.9+0xc1/0x17f executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.551952] [] warn_slowpath_null+0x2c/0x40 [ 22.557922] [] inet_sock_destruct+0x598/0x760 [ 22.564062] [] ? ipv4_mib_init_net+0x570/0x570 [ 22.570278] [] l2tp_tunnel_destruct+0x339/0x590 [ 22.576593] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 22.583096] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 22.589585] [] __sk_destruct+0x55/0x590 [ 22.595210] [] rcu_process_callbacks+0x8ae/0x12b0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.601701] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 22.608354] [] ? sock_set_timeout+0x210/0x210 [ 22.614485] [] __do_softirq+0x210/0x940 [ 22.620110] [] irq_exit+0x114/0x150 [ 22.625382] [] smp_apic_timer_interrupt+0x81/0xa0 [ 22.631882] [] apic_timer_interrupt+0xa0/0xb0 [ 22.638007] [ 22.640054] [] ? _raw_spin_unlock_irq+0x2e/0x50 [ 22.646401] [] finish_task_switch+0x1ed/0x640 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.652534] [] ? finish_task_switch+0x1c1/0x640 [ 22.658836] [] ? __switch_to_asm+0x34/0x70 [ 22.664730] [] ? __switch_to_asm+0x40/0x70 [ 22.670609] [] __schedule+0x655/0x1bd0 [ 22.676146] [] ? check_preemption_disabled+0x3b/0x170 [ 22.682979] [] schedule+0x7f/0x1b0 [ 22.688167] [] schedule_preempt_disabled+0x13/0x20 [ 22.694740] [] cpu_startup_entry+0x1bf/0x380 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.700785] [] ? cpu_in_idle+0x20/0x20 [ 22.706314] [] rest_init+0x183/0x189 [ 22.711667] [] start_kernel+0x67e/0x6b2 [ 22.717275] [] ? thread_stack_cache_init+0xb/0xb [ 22.723673] [] ? x86_family+0x32/0x40 [ 22.729110] [] ? early_idt_handler_array+0x120/0x120 [ 22.735845] [] x86_64_start_reservations+0x29/0x2b [ 22.742432] [] x86_64_start_kernel+0x13f/0x162 [ 22.749151] Dumping ftrace buffer: [ 22.752696] (ftrace buffer empty) [ 22.756383] Kernel Offset: disabled [ 22.760122] Rebooting in 86400 seconds..