[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.739985] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 14.654745] random: sshd: uninitialized urandom read (32 bytes read) [ 14.882384] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.374058] random: sshd: uninitialized urandom read (32 bytes read) [ 15.513608] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 21.046771] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 21.268058] ------------[ cut here ]------------ [ 21.272849] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 21.281338] Kernel panic - not syncing: panic_on_warn set ... [ 21.281338] [ 21.288736] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.124-g09eb2ba #31 [ 21.295724] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.305832] ffff8801db207cc0 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff [ 21.313829] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 21.321830] ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6 [ 21.329840] Call Trace: [ 21.332414] [ 21.334458] [] dump_stack+0xc1/0x128 [ 21.339818] [] panic+0x1bf/0x3bc [ 21.344808] [] ? add_taint.cold.6+0x16/0x16 [ 21.350757] [] ? __warn.cold.9+0xa6/0x17f [ 21.356547] [] ? inet_sock_destruct+0x598/0x760 [ 21.362844] [] __warn.cold.9+0xc1/0x17f [ 21.368446] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 21.374914] [] warn_slowpath_null+0x2c/0x40 [ 21.380862] [] inet_sock_destruct+0x598/0x760 [ 21.387002] [] ? ipv4_mib_init_net+0x570/0x570 [ 21.393211] [] l2tp_tunnel_destruct+0x339/0x590 [ 21.399504] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 21.405969] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 21.412435] [] __sk_destruct+0x55/0x590 [ 21.418044] [] rcu_process_callbacks+0x8ae/0x12b0 [ 21.424557] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 21.431199] [] ? sock_set_timeout+0x210/0x210 [ 21.437321] [] __do_softirq+0x210/0x940 [ 21.442921] [] irq_exit+0x114/0x150 [ 21.448173] [] smp_apic_timer_interrupt+0x81/0xa0 [ 21.454645] [] apic_timer_interrupt+0xa0/0xb0 [ 21.460762] [ 21.462802] [] ? native_safe_halt+0x6/0x10 [ 21.468682] [] default_idle+0x55/0x360 [ 21.474193] [] arch_cpu_idle+0x10/0x20 [ 21.479725] [] default_idle_call+0x45/0x60 [ 21.485672] [] cpu_startup_entry+0x2b5/0x380 [ 21.491706] [] ? cpu_in_idle+0x20/0x20 [ 21.497232] [] rest_init+0x183/0x189 [ 21.502573] [] start_kernel+0x67e/0x6b2 [ 21.508171] [] ? thread_stack_cache_init+0xb/0xb [ 21.514549] [] ? x86_family+0x32/0x40 [ 21.519974] [] ? early_idt_handler_array+0x120/0x120 [ 21.526715] [] x86_64_start_reservations+0x29/0x2b [ 21.533272] [] x86_64_start_kernel+0x13f/0x162 [ 21.539902] Dumping ftrace buffer: [ 21.543450] (ftrace buffer empty) [ 21.547141] Kernel Offset: disabled [ 21.550748] Rebooting in 86400 seconds..