[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   16.431947] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.145848] random: sshd: uninitialized urandom read (32 bytes read)
[   25.606111] random: sshd: uninitialized urandom read (32 bytes read)
[   26.101155] random: sshd: uninitialized urandom read (32 bytes read)
[   30.609370] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts.
[   36.141094] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   36.357354] ------------[ cut here ]------------
[   36.362146] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   36.370626] Kernel panic - not syncing: panic_on_warn set ...
[   36.370626] 
[   36.378025] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.121-g681e57b #25
[   36.385016] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   36.394342]  ffff8801db307cc0 ffffffff81eb7e29 ffffffff83c48ac0 00000000ffffffff
[   36.402318]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   36.410305]  ffffffff81423b05 0000000041b58ab3 ffffffff843bb838 ffffffff81423946
[   36.418280] Call Trace:
[   36.420831]  <IRQ> [   36.422872]  [<ffffffff81eb7e29>] dump_stack+0xc1/0x128
[   36.428475]  [<ffffffff81423b05>] panic+0x1bf/0x3bc
[   36.433513]  [<ffffffff81423946>] ? add_taint.cold.6+0x16/0x16
[   36.439473]  [<ffffffff81423dd6>] ? __warn.cold.9+0xa6/0x17f
[   36.445248]  [<ffffffff8342a758>] ? inet_sock_destruct+0x598/0x760
[   36.451551]  [<ffffffff81423df1>] __warn.cold.9+0xc1/0x17f
[   36.457163]  [<ffffffff836c327f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   36.463694]  [<ffffffff81137f4c>] warn_slowpath_null+0x2c/0x40
[   36.469655]  [<ffffffff8342a758>] inet_sock_destruct+0x598/0x760
[   36.475779]  [<ffffffff8342a1c0>] ? ipv4_mib_init_net+0x570/0x570
[   36.481991]  [<ffffffff836c3ac9>] l2tp_tunnel_destruct+0x339/0x590
[   36.488290]  [<ffffffff836c393a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   36.494765]  [<ffffffff836c3790>] ? l2tp_tunnel_del_work+0x470/0x470
[   36.501241]  [<ffffffff830260f5>] __sk_destruct+0x55/0x590
[   36.506851]  [<ffffffff8128963e>] rcu_process_callbacks+0x8ae/0x12b0
[   36.513331]  [<ffffffff8128971e>] ? rcu_process_callbacks+0x98e/0x12b0
[   36.520062]  [<ffffffff830260a0>] ? sock_set_timeout+0x210/0x210
[   36.526242]  [<ffffffff83a068c0>] __do_softirq+0x210/0x940
[   36.531847]  [<ffffffff8114d0e4>] irq_exit+0x114/0x150
[   36.537097]  [<ffffffff83a054a1>] smp_apic_timer_interrupt+0x81/0xa0
[   36.543585]  [<ffffffff83a01630>] apic_timer_interrupt+0xa0/0xb0
[   36.549746]  <EOI> [   36.551795]  [<ffffffff839fe8d6>] ? native_safe_halt+0x6/0x10
[   36.557719]  [<ffffffff81237a9d>] ? trace_hardirqs_on+0xd/0x10
[   36.563687]  [<ffffffff839fdf15>] default_idle+0x55/0x360
[   36.569214]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   36.574754]  [<ffffffff839fed35>] default_idle_call+0x45/0x60
[   36.580642]  [<ffffffff81225025>] cpu_startup_entry+0x2b5/0x380
[   36.580646]  [<ffffffff81224d70>] ? cpu_in_idle+0x20/0x20
[   36.580652]  [<ffffffff810af308>] start_secondary+0x328/0x400
[   36.580657]  [<ffffffff810aefe0>] ? set_cpu_sibling_map+0x1340/0x1340
[   36.580980] Dumping ftrace buffer:
[   36.581002]    (ftrace buffer empty)
[   36.581004] Kernel Offset: disabled
[   36.615724] Rebooting in 86400 seconds..