[....] 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[   13.278130] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.811986] random: sshd: uninitialized urandom read (32 bytes read)
[   20.104951] random: sshd: uninitialized urandom read (32 bytes read)
[   20.635413] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts.
[   26.304212] urandom_read: 1 callbacks suppressed
[   26.304214] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   26.502136] ------------[ cut here ]------------
[   26.506950] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   26.515430] Kernel panic - not syncing: panic_on_warn set ...
[   26.515430] 
[   26.522764] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.120-gf85543b #76
[   26.529742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   26.539065]  ffff8801db307cc0 ffffffff81eb8049 ffffffff83c48ac0 00000000ffffffff
[   26.547056]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   26.555101]  ffffffff814239b5 0000000041b58ab3 ffffffff843bb7e8 ffffffff814237f6
[   26.563096] Call Trace:
[   26.565649]  <IRQ> [   26.567685]  [<ffffffff81eb8049>] dump_stack+0xc1/0x128
[   26.573035]  [<ffffffff814239b5>] panic+0x1bf/0x3bc
[   26.578085]  [<ffffffff814237f6>] ? add_taint.cold.6+0x16/0x16
[   26.584038]  [<ffffffff81423c86>] ? __warn.cold.9+0xa6/0x17f
[   26.589810]  [<ffffffff8342a758>] ? inet_sock_destruct+0x598/0x760
[   26.596098]  [<ffffffff81423ca1>] __warn.cold.9+0xc1/0x17f
[   26.601715]  [<ffffffff836c327f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   26.608196]  [<ffffffff81137dfc>] warn_slowpath_null+0x2c/0x40
[   26.614139]  [<ffffffff8342a758>] inet_sock_destruct+0x598/0x760
[   26.620257]  [<ffffffff8342a1c0>] ? ipv4_mib_init_net+0x570/0x570
[   26.626485]  [<ffffffff836c3ac9>] l2tp_tunnel_destruct+0x339/0x590
[   26.632836]  [<ffffffff836c393a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   26.639307]  [<ffffffff836c3790>] ? l2tp_tunnel_del_work+0x470/0x470
[   26.645774]  [<ffffffff830260f5>] __sk_destruct+0x55/0x590
[   26.651373]  [<ffffffff812894ee>] rcu_process_callbacks+0x8ae/0x12b0
[   26.657838]  [<ffffffff812895ce>] ? rcu_process_callbacks+0x98e/0x12b0
[   26.664480]  [<ffffffff830260a0>] ? sock_set_timeout+0x210/0x210
[   26.670610]  [<ffffffff83a068c0>] __do_softirq+0x210/0x940
[   26.676208]  [<ffffffff8114cf94>] irq_exit+0x114/0x150
[   26.681456]  [<ffffffff83a054a1>] smp_apic_timer_interrupt+0x81/0xa0
[   26.687925]  [<ffffffff83a01630>] apic_timer_interrupt+0xa0/0xb0
[   26.694037]  <EOI> [   26.696074]  [<ffffffff839fe8d6>] ? native_safe_halt+0x6/0x10
[   26.701964]  [<ffffffff8123794d>] ? trace_hardirqs_on+0xd/0x10
[   26.707907]  [<ffffffff839fdf15>] default_idle+0x55/0x360
[   26.713422]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   26.718935]  [<ffffffff839fed35>] default_idle_call+0x45/0x60
[   26.724793]  [<ffffffff81224ed5>] cpu_startup_entry+0x2b5/0x380
[   26.730822]  [<ffffffff81224c20>] ? cpu_in_idle+0x20/0x20
[   26.736337]  [<ffffffff810af308>] start_secondary+0x328/0x400
[   26.742199]  [<ffffffff810aefe0>] ? set_cpu_sibling_map+0x1340/0x1340
[   26.749144] Dumping ftrace buffer:
[   26.752689]    (ftrace buffer empty)
[   26.756383] Kernel Offset: disabled
[   26.759990] Rebooting in 86400 seconds..