[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.273023] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.365966] random: sshd: uninitialized urandom read (32 bytes read)
[   18.819931] random: sshd: uninitialized urandom read (32 bytes read)
[   19.327043] random: sshd: uninitialized urandom read (32 bytes read)
[   26.920885] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts.
[   32.524412] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   32.745094] ------------[ cut here ]------------
[   32.749899] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   32.758492] Kernel panic - not syncing: panic_on_warn set ...
[   32.758492] 
[   32.765848] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.124-g6a1b592 #34
[   32.772839] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.782241]  ffff8801db207cc0 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff
[   32.790253]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   32.798256]  ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6
[   32.806332] Call Trace:
[   32.808891]  <IRQ> [   32.810935]  [<ffffffff81eb95e9>] dump_stack+0xc1/0x128
[   32.816298]  [<ffffffff81423eb5>] panic+0x1bf/0x3bc
[   32.821293]  [<ffffffff81423cf6>] ? add_taint.cold.6+0x16/0x16
[   32.827240]  [<ffffffff81424186>] ? __warn.cold.9+0xa6/0x17f
[   32.833015]  [<ffffffff8342c878>] ? inet_sock_destruct+0x598/0x760
[   32.839310]  [<ffffffff814241a1>] __warn.cold.9+0xc1/0x17f
[   32.844926]  [<ffffffff836c4fef>] ? l2tp_tunnel_closeall+0x2af/0x350
[   32.851396]  [<ffffffff811383bc>] warn_slowpath_null+0x2c/0x40
[   32.857446]  [<ffffffff8342c878>] inet_sock_destruct+0x598/0x760
[   32.863569]  [<ffffffff8342c2e0>] ? ipv4_mib_init_net+0x570/0x570
[   32.869780]  [<ffffffff836c5839>] l2tp_tunnel_destruct+0x339/0x590
[   32.876086]  [<ffffffff836c56aa>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   32.882557]  [<ffffffff836c5500>] ? l2tp_tunnel_del_work+0x470/0x470
[   32.889027]  [<ffffffff830281f5>] __sk_destruct+0x55/0x590
[   32.894630]  [<ffffffff812899ee>] rcu_process_callbacks+0x8ae/0x12b0
[   32.901097]  [<ffffffff81289ace>] ? rcu_process_callbacks+0x98e/0x12b0
[   32.907745]  [<ffffffff830281a0>] ? sock_set_timeout+0x210/0x210
[   32.913882]  [<ffffffff83a085c0>] __do_softirq+0x210/0x940
[   32.919491]  [<ffffffff8114d554>] irq_exit+0x114/0x150
[   32.924751]  [<ffffffff83a071a1>] smp_apic_timer_interrupt+0x81/0xa0
[   32.931220]  [<ffffffff83a03330>] apic_timer_interrupt+0xa0/0xb0
[   32.937340]  <EOI> [   32.939383]  [<ffffffff83a00606>] ? native_safe_halt+0x6/0x10
[   32.945268]  [<ffffffff839ffc45>] default_idle+0x55/0x360
[   32.950788]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   32.956305]  [<ffffffff83a00a65>] default_idle_call+0x45/0x60
[   32.962171]  [<ffffffff81225495>] cpu_startup_entry+0x2b5/0x380
[   32.968203]  [<ffffffff812251e0>] ? cpu_in_idle+0x20/0x20
[   32.973722]  [<ffffffff839ed8cc>] rest_init+0x183/0x189
[   32.979068]  [<ffffffff84c98943>] start_kernel+0x67e/0x6b2
[   32.984673]  [<ffffffff84c982c5>] ? thread_stack_cache_init+0xb/0xb
[   32.991184]  [<ffffffff81ee81e2>] ? x86_family+0x32/0x40
[   32.996627]  [<ffffffff84c97120>] ? early_idt_handler_array+0x120/0x120
[   33.003374]  [<ffffffff84c9729a>] x86_64_start_reservations+0x29/0x2b
[   33.009943]  [<ffffffff84c973db>] x86_64_start_kernel+0x13f/0x162
[   33.016628] Dumping ftrace buffer:
[   33.020173]    (ftrace buffer empty)
[   33.023863] Kernel Offset: disabled
[   33.027471] Rebooting in 86400 seconds..