[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.912067] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.667493] random: sshd: uninitialized urandom read (32 bytes read) [ 27.051102] random: sshd: uninitialized urandom read (32 bytes read) [ 27.541176] random: sshd: uninitialized urandom read (32 bytes read) [ 27.680403] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 33.455749] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 33.663380] ------------[ cut here ]------------ [ 33.668378] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 33.676871] Kernel panic - not syncing: panic_on_warn set ... [ 33.676871] [ 33.684226] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.123-g520d10d3 #81 [ 33.691312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.700655] ffff8801db207cc0 ffffffff81eb9689 ffffffff83c48ac0 00000000ffffffff [ 33.708731] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 33.716821] ffffffff81423f75 0000000041b58ab3 ffffffff843bb880 ffffffff81423db6 [ 33.724907] Call Trace: [ 33.727480] [ 33.729547] [] dump_stack+0xc1/0x128 [ 33.735041] [] panic+0x1bf/0x3bc [ 33.740056] [] ? add_taint.cold.6+0x16/0x16 [ 33.746040] [] ? __warn.cold.9+0xa6/0x17f [ 33.751834] [] ? inet_sock_destruct+0x598/0x760 [ 33.758146] [] __warn.cold.9+0xc1/0x17f [ 33.763769] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 33.770550] [] warn_slowpath_null+0x2c/0x40 [ 33.776520] [] inet_sock_destruct+0x598/0x760 [ 33.782742] [] ? ipv4_mib_init_net+0x570/0x570 [ 33.788966] [] l2tp_tunnel_destruct+0x339/0x590 [ 33.795298] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 33.801780] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 33.808419] [] __sk_destruct+0x55/0x590 [ 33.814365] [] rcu_process_callbacks+0x8ae/0x12b0 [ 33.820846] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 33.827505] [] ? sock_set_timeout+0x210/0x210 [ 33.833640] [] __do_softirq+0x210/0x940 [ 33.839347] [] irq_exit+0x114/0x150 [ 33.844615] [] smp_apic_timer_interrupt+0x81/0xa0 [ 33.851101] [] apic_timer_interrupt+0xa0/0xb0 [ 33.857349] [ 33.859417] [] ? native_safe_halt+0x6/0x10 [ 33.865316] [] default_idle+0x55/0x360 [ 33.871030] [] arch_cpu_idle+0x10/0x20 [ 33.876573] [] default_idle_call+0x45/0x60 [ 33.882453] [] cpu_startup_entry+0x2b5/0x380 [ 33.888510] [] ? cpu_in_idle+0x20/0x20 [ 33.894042] [] rest_init+0x183/0x189 [ 33.899396] [] start_kernel+0x67e/0x6b2 [ 33.905033] [] ? thread_stack_cache_init+0xb/0xb [ 33.911434] [] ? x86_family+0x32/0x40 [ 33.916875] [] ? early_idt_handler_array+0x120/0x120 [ 33.923623] [] x86_64_start_reservations+0x29/0x2b [ 33.930289] [] x86_64_start_kernel+0x13f/0x162 [ 33.936973] Dumping ftrace buffer: [ 33.940564] (ftrace buffer empty) [ 33.944272] Kernel Offset: disabled [ 33.947902] Rebooting in 86400 seconds..