[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.065164] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   17.328978] random: sshd: uninitialized urandom read (32 bytes read)
[   17.644555] random: sshd: uninitialized urandom read (32 bytes read)
[   18.687031] random: sshd: uninitialized urandom read (32 bytes read)
[   18.849074] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts.
[   24.249595] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   24.479214] ------------[ cut here ]------------
[   24.484000] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   24.492481] Kernel panic - not syncing: panic_on_warn set ...
[   24.492481] 
[   24.499824] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.116-g0137ea2 #70
[   24.506826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   24.516154]  ffff8801db307cc0 ffffffff81eb46a9 ffffffff83c48980 00000000ffffffff
[   24.524144]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   24.532148]  ffffffff81421a75 0000000041b58ab3 ffffffff843bbff8 ffffffff814218b6
[   24.540126] Call Trace:
[   24.542678]  <IRQ> [   24.544716]  [<ffffffff81eb46a9>] dump_stack+0xc1/0x128
[   24.550073]  [<ffffffff81421a75>] panic+0x1bf/0x3bc
[   24.555061]  [<ffffffff814218b6>] ? add_taint.cold.6+0x16/0x16
[   24.561004]  [<ffffffff81421d46>] ? __warn.cold.9+0xa6/0x17f
[   24.566779]  [<ffffffff83426628>] ? inet_sock_destruct+0x598/0x760
[   24.573074]  [<ffffffff81421d61>] __warn.cold.9+0xc1/0x17f
[   24.578674]  [<ffffffff836bf1cf>] ? l2tp_tunnel_closeall+0x2af/0x350
[   24.585143]  [<ffffffff8113683c>] warn_slowpath_null+0x2c/0x40
[   24.591089]  [<ffffffff83426628>] inet_sock_destruct+0x598/0x760
[   24.597207]  [<ffffffff83426090>] ? ipv4_mib_init_net+0x570/0x570
[   24.603413]  [<ffffffff836bfa19>] l2tp_tunnel_destruct+0x339/0x590
[   24.609713]  [<ffffffff836bf88a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   24.616195]  [<ffffffff836bf6e0>] ? l2tp_tunnel_del_work+0x470/0x470
[   24.622662]  [<ffffffff83022095>] __sk_destruct+0x55/0x590
[   24.628261]  [<ffffffff812877ce>] rcu_process_callbacks+0x8ae/0x12b0
[   24.634727]  [<ffffffff812878ae>] ? rcu_process_callbacks+0x98e/0x12b0
[   24.641366]  [<ffffffff83022040>] ? sock_set_timeout+0x210/0x210
[   24.647495]  [<ffffffff83a027fb>] __do_softirq+0x20b/0x937
[   24.653095]  [<ffffffff8114b277>] irq_exit+0x147/0x190
[   24.658345]  [<ffffffff83a013e1>] smp_apic_timer_interrupt+0x81/0xa0
[   24.664810]  [<ffffffff839fd570>] apic_timer_interrupt+0xa0/0xb0
[   24.670937]  <EOI> [   24.672977]  [<ffffffff839fa816>] ? native_safe_halt+0x6/0x10
[   24.678852]  [<ffffffff81235c4d>] ? trace_hardirqs_on+0xd/0x10
[   24.684797]  [<ffffffff839f9e55>] default_idle+0x55/0x360
[   24.690311]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   24.695825]  [<ffffffff839fac75>] default_idle_call+0x45/0x60
[   24.701682]  [<ffffffff812231d5>] cpu_startup_entry+0x2b5/0x380
[   24.707714]  [<ffffffff81222f20>] ? cpu_in_idle+0x20/0x20
[   24.713254]  [<ffffffff810aefa8>] start_secondary+0x328/0x400
[   24.719114]  [<ffffffff810aec80>] ? set_cpu_sibling_map+0x1300/0x1300
[   24.726069] Dumping ftrace buffer:
[   24.729608]    (ftrace buffer empty)
[   24.733291] Kernel Offset: disabled
[   24.736908] Rebooting in 86400 seconds..