[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.920989] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.548933] random: sshd: uninitialized urandom read (32 bytes read)
[   18.870410] random: sshd: uninitialized urandom read (32 bytes read)
[   19.300885] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts.
[   24.984676] urandom_read: 1 callbacks suppressed
[   24.984680] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   25.180530] ------------[ cut here ]------------
[   25.185322] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   25.193898] Kernel panic - not syncing: panic_on_warn set ...
[   25.193898] 
[   25.201269] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.123-g8dd3fc2 #31
[   25.208262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   25.217703]  ffff8801db207cc0 ffffffff81eb9689 ffffffff83c48ac0 00000000ffffffff
[   25.225751]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   25.233799]  ffffffff81423f75 0000000041b58ab3 ffffffff843bb878 ffffffff81423db6
[   25.241810] Call Trace:
[   25.244369]  <IRQ> [   25.246416]  [<ffffffff81eb9689>] dump_stack+0xc1/0x128
[   25.251777]  [<ffffffff81423f75>] panic+0x1bf/0x3bc
[   25.256769]  [<ffffffff81423db6>] ? add_taint.cold.6+0x16/0x16
[   25.262714]  [<ffffffff81424246>] ? __warn.cold.9+0xa6/0x17f
[   25.268564]  [<ffffffff8342c778>] ? inet_sock_destruct+0x598/0x760
[   25.274871]  [<ffffffff81424261>] __warn.cold.9+0xc1/0x17f
[   25.280483]  [<ffffffff836c526f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   25.286974]  [<ffffffff811383bc>] warn_slowpath_null+0x2c/0x40
[   25.292929]  [<ffffffff8342c778>] inet_sock_destruct+0x598/0x760
[   25.299054]  [<ffffffff8342c1e0>] ? ipv4_mib_init_net+0x570/0x570
[   25.305549]  [<ffffffff836c5ab9>] l2tp_tunnel_destruct+0x339/0x590
[   25.311848]  [<ffffffff836c592a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   25.318364]  [<ffffffff836c5780>] ? l2tp_tunnel_del_work+0x470/0x470
[   25.324848]  [<ffffffff830280f5>] __sk_destruct+0x55/0x590
[   25.330461]  [<ffffffff81289aae>] rcu_process_callbacks+0x8ae/0x12b0
[   25.336962]  [<ffffffff81289b8e>] ? rcu_process_callbacks+0x98e/0x12b0
[   25.343617]  [<ffffffff830280a0>] ? sock_set_timeout+0x210/0x210
[   25.349754]  [<ffffffff83a08880>] __do_softirq+0x210/0x940
[   25.355356]  [<ffffffff8114d554>] irq_exit+0x114/0x150
[   25.360626]  [<ffffffff83a07461>] smp_apic_timer_interrupt+0x81/0xa0
[   25.367099]  [<ffffffff83a035f0>] apic_timer_interrupt+0xa0/0xb0
[   25.373259]  <EOI> [   25.375308]  [<ffffffff83a008c6>] ? native_safe_halt+0x6/0x10
[   25.381191]  [<ffffffff839fff05>] default_idle+0x55/0x360
[   25.386709]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   25.392222]  [<ffffffff83a00d25>] default_idle_call+0x45/0x60
[   25.398270]  [<ffffffff81225495>] cpu_startup_entry+0x2b5/0x380
[   25.404306]  [<ffffffff812251e0>] ? cpu_in_idle+0x20/0x20
[   25.409820]  [<ffffffff839edb8c>] rest_init+0x183/0x189
[   25.415162]  [<ffffffff84c98943>] start_kernel+0x67e/0x6b2
[   25.420768]  [<ffffffff84c982c5>] ? thread_stack_cache_init+0xb/0xb
[   25.427154]  [<ffffffff81ee8282>] ? x86_family+0x32/0x40
[   25.432587]  [<ffffffff84c97120>] ? early_idt_handler_array+0x120/0x120
[   25.439434]  [<ffffffff84c9729a>] x86_64_start_reservations+0x29/0x2b
[   25.445990]  [<ffffffff84c973db>] x86_64_start_kernel+0x13f/0x162
[   25.452713] Dumping ftrace buffer:
[   25.456252]    (ftrace buffer empty)
[   25.459940] Kernel Offset: disabled
[   25.463664] Rebooting in 86400 seconds..