[....] 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[   14.428553] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.061767] random: sshd: uninitialized urandom read (32 bytes read)
[   23.370260] random: sshd: uninitialized urandom read (32 bytes read)
[   23.874742] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts.
[   29.530662] urandom_read: 1 callbacks suppressed
[   29.530666] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   29.759124] ------------[ cut here ]------------
[   29.763914] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   29.772428] Kernel panic - not syncing: panic_on_warn set ...
[   29.772428] 
[   29.779773] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.122-g54068d6 #26
[   29.786759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.796100]  ffff8801db307cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff
[   29.804207]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   29.812257]  ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76
[   29.820270] Call Trace:
[   29.822832]  <IRQ> [   29.824889]  [<ffffffff81eb8829>] dump_stack+0xc1/0x128
[   29.830267]  [<ffffffff81423f35>] panic+0x1bf/0x3bc
[   29.835275]  [<ffffffff81423d76>] ? add_taint.cold.6+0x16/0x16
[   29.841234]  [<ffffffff81424206>] ? __warn.cold.9+0xa6/0x17f
[   29.847066]  [<ffffffff8342b758>] ? inet_sock_destruct+0x598/0x760
[   29.853384]  [<ffffffff81424221>] __warn.cold.9+0xc1/0x17f
[   29.858999]  [<ffffffff836c427f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   29.865485]  [<ffffffff8113837c>] warn_slowpath_null+0x2c/0x40
[   29.871448]  [<ffffffff8342b758>] inet_sock_destruct+0x598/0x760
[   29.877599]  [<ffffffff8342b1c0>] ? ipv4_mib_init_net+0x570/0x570
[   29.883821]  [<ffffffff836c4ac9>] l2tp_tunnel_destruct+0x339/0x590
[   29.890140]  [<ffffffff836c493a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   29.896625]  [<ffffffff836c4790>] ? l2tp_tunnel_del_work+0x470/0x470
[   29.903164]  [<ffffffff830270f5>] __sk_destruct+0x55/0x590
[   29.908821]  [<ffffffff81289a6e>] rcu_process_callbacks+0x8ae/0x12b0
[   29.915319]  [<ffffffff81289b4e>] ? rcu_process_callbacks+0x98e/0x12b0
[   29.921972]  [<ffffffff830270a0>] ? sock_set_timeout+0x210/0x210
[   29.928112]  [<ffffffff83a078c0>] __do_softirq+0x210/0x940
[   29.933874]  [<ffffffff8114d514>] irq_exit+0x114/0x150
[   29.939140]  [<ffffffff83a064a1>] smp_apic_timer_interrupt+0x81/0xa0
[   29.945619]  [<ffffffff83a02630>] apic_timer_interrupt+0xa0/0xb0
[   29.951783]  <EOI> [   29.953840]  [<ffffffff839ff8d6>] ? native_safe_halt+0x6/0x10
[   29.959727]  [<ffffffff81237ecd>] ? trace_hardirqs_on+0xd/0x10
[   29.965685]  [<ffffffff839fef15>] default_idle+0x55/0x360
[   29.971227]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   29.976756]  [<ffffffff839ffd35>] default_idle_call+0x45/0x60
[   29.982632]  [<ffffffff81225455>] cpu_startup_entry+0x2b5/0x380
[   29.988817]  [<ffffffff812251a0>] ? cpu_in_idle+0x20/0x20
[   29.994773]  [<ffffffff810af308>] start_secondary+0x328/0x400
[   30.000953]  [<ffffffff810aefe0>] ? set_cpu_sibling_map+0x1340/0x1340
[   30.008329] Dumping ftrace buffer:
[   30.011911]    (ftrace buffer empty)
[   30.015606] Kernel Offset: disabled
[   30.019221] Rebooting in 86400 seconds..