[....] 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[   14.939994] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.229306] random: sshd: uninitialized urandom read (32 bytes read)
[   18.512558] random: sshd: uninitialized urandom read (32 bytes read)
[   19.027186] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts.
[   24.811795] urandom_read: 1 callbacks suppressed
[   24.811798] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   25.025139] ------------[ cut here ]------------
[   25.029930] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   25.038418] Kernel panic - not syncing: panic_on_warn set ...
[   25.038418] 
[   25.045772] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.122-g54068d6 #26
[   25.052760] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   25.062235]  ffff8801db307cc0 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff
[   25.070269]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   25.078273]  ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76
[   25.086421] Call Trace:
[   25.088989]  <IRQ> [   25.091038]  [<ffffffff81eb8829>] dump_stack+0xc1/0x128
[   25.096632]  [<ffffffff81423f35>] panic+0x1bf/0x3bc
[   25.101626]  [<ffffffff81423d76>] ? add_taint.cold.6+0x16/0x16
[   25.107654]  [<ffffffff81424206>] ? __warn.cold.9+0xa6/0x17f
[   25.113438]  [<ffffffff8342b758>] ? inet_sock_destruct+0x598/0x760
[   25.119834]  [<ffffffff81424221>] __warn.cold.9+0xc1/0x17f
[   25.125553]  [<ffffffff836c427f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   25.132052]  [<ffffffff8113837c>] warn_slowpath_null+0x2c/0x40
[   25.138002]  [<ffffffff8342b758>] inet_sock_destruct+0x598/0x760
[   25.144126]  [<ffffffff8342b1c0>] ? ipv4_mib_init_net+0x570/0x570
[   25.150350]  [<ffffffff836c4ac9>] l2tp_tunnel_destruct+0x339/0x590
[   25.156681]  [<ffffffff836c493a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   25.163233]  [<ffffffff836c4790>] ? l2tp_tunnel_del_work+0x470/0x470
[   25.169710]  [<ffffffff830270f5>] __sk_destruct+0x55/0x590
[   25.175321]  [<ffffffff81289a6e>] rcu_process_callbacks+0x8ae/0x12b0
[   25.182047]  [<ffffffff81289b4e>] ? rcu_process_callbacks+0x98e/0x12b0
[   25.188688]  [<ffffffff830270a0>] ? sock_set_timeout+0x210/0x210
[   25.194811]  [<ffffffff83a078c0>] __do_softirq+0x210/0x940
[   25.200548]  [<ffffffff8114d514>] irq_exit+0x114/0x150
[   25.205806]  [<ffffffff83a064a1>] smp_apic_timer_interrupt+0x81/0xa0
[   25.212374]  [<ffffffff83a02630>] apic_timer_interrupt+0xa0/0xb0
[   25.218499]  <EOI> [   25.220543]  [<ffffffff839ff8d6>] ? native_safe_halt+0x6/0x10
[   25.226426]  [<ffffffff81237ecd>] ? trace_hardirqs_on+0xd/0x10
[   25.232375]  [<ffffffff839fef15>] default_idle+0x55/0x360
[   25.237898]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   25.243414]  [<ffffffff839ffd35>] default_idle_call+0x45/0x60
[   25.249326]  [<ffffffff81225455>] cpu_startup_entry+0x2b5/0x380
[   25.255364]  [<ffffffff812251a0>] ? cpu_in_idle+0x20/0x20
[   25.260878]  [<ffffffff810af308>] start_secondary+0x328/0x400
[   25.266747]  [<ffffffff810aefe0>] ? set_cpu_sibling_map+0x1340/0x1340
[   25.273623] Dumping ftrace buffer:
[   25.277159]    (ftrace buffer empty)
[   25.280848] Kernel Offset: disabled
[   25.284455] Rebooting in 86400 seconds..