[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.654007] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.001545] random: sshd: uninitialized urandom read (32 bytes read) [ 20.508316] random: sshd: uninitialized urandom read (32 bytes read) [ 21.013864] random: sshd: uninitialized urandom read (32 bytes read) [ 21.145567] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. [ 26.630521] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program [ 26.845819] ------------[ cut here ]------------ [ 26.850586] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760 [ 26.859148] Kernel panic - not syncing: panic_on_warn set ... [ 26.859148] [ 26.866651] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.119-g92e8704 #26 [ 26.873652] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.883143] ffff8801db207cc0 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff [ 26.891246] 0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80 [ 26.899251] ffffffff81421c95 0000000041b58ab3 ffffffff843bc020 ffffffff81421ad6 [ 26.907288] Call Trace: [ 26.909930] [ 26.911985] [] dump_stack+0xc1/0x128 [ 26.917447] [] panic+0x1bf/0x3bc [ 26.922535] [] ? add_taint.cold.6+0x16/0x16 [ 26.928497] [] ? __warn.cold.9+0xa6/0x17f [ 26.934372] [] ? inet_sock_destruct+0x598/0x760 [ 26.940759] [] __warn.cold.9+0xc1/0x17f [ 26.946461] [] ? l2tp_tunnel_closeall+0x2af/0x350 [ 26.952935] [] warn_slowpath_null+0x2c/0x40 [ 26.958945] [] inet_sock_destruct+0x598/0x760 [ 26.965073] [] ? ipv4_mib_init_net+0x570/0x570 [ 26.971286] [] l2tp_tunnel_destruct+0x339/0x590 [ 26.977583] [] ? l2tp_tunnel_destruct+0x1aa/0x590 [ 26.984052] [] ? l2tp_tunnel_del_work+0x470/0x470 [ 26.990527] [] __sk_destruct+0x55/0x590 [ 26.996196] [] rcu_process_callbacks+0x8ae/0x12b0 [ 27.002671] [] ? rcu_process_callbacks+0x98e/0x12b0 [ 27.009376] [] ? sock_set_timeout+0x210/0x210 [ 27.015516] [] __do_softirq+0x20b/0x937 [ 27.021180] [] irq_exit+0x147/0x190 [ 27.026441] [] smp_apic_timer_interrupt+0x81/0xa0 [ 27.032915] [] apic_timer_interrupt+0xa0/0xb0 [ 27.039039] [ 27.041092] [] ? native_safe_halt+0x6/0x10 [ 27.047009] [] default_idle+0x55/0x360 [ 27.052532] [] arch_cpu_idle+0x10/0x20 [ 27.058052] [] default_idle_call+0x45/0x60 [ 27.063977] [] cpu_startup_entry+0x2b5/0x380 [ 27.070074] [] ? cpu_in_idle+0x20/0x20 [ 27.075657] [] rest_init+0x183/0x189 [ 27.081111] [] start_kernel+0x67e/0x6b2 [ 27.086714] [] ? thread_stack_cache_init+0xb/0xb [ 27.093098] [] ? x86_family+0x32/0x40 [ 27.098533] [] ? early_idt_handler_array+0x120/0x120 [ 27.105793] [] x86_64_start_reservations+0x29/0x2b [ 27.112362] [] x86_64_start_kernel+0x13f/0x162 [ 27.119152] Dumping ftrace buffer: [ 27.122692] (ftrace buffer empty) [ 27.126379] Kernel Offset: disabled [ 27.129987] Rebooting in 86400 seconds..