[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   16.584548] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.474659] random: sshd: uninitialized urandom read (32 bytes read)
[   26.906203] random: sshd: uninitialized urandom read (32 bytes read)
[   27.394507] random: sshd: uninitialized urandom read (32 bytes read)
[   32.755351] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts.
[   38.276769] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   38.498039] ------------[ cut here ]------------
[   38.503143] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   38.511653] Kernel panic - not syncing: panic_on_warn set ...
[   38.511653] 
[   38.519025] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.119-g9dc978d #75
[   38.526127] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.535480]  ffff8801db207cc0 ffffffff81eb4be9 ffffffff83c48980 00000000ffffffff
[   38.543661]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   38.552213]  ffffffff81421c95 0000000041b58ab3 ffffffff843bc020 ffffffff81421ad6
[   38.560433] Call Trace:
[   38.563002]  <IRQ> [   38.565059]  [<ffffffff81eb4be9>] dump_stack+0xc1/0x128
[   38.570463]  [<ffffffff81421c95>] panic+0x1bf/0x3bc
[   38.575489]  [<ffffffff81421ad6>] ? add_taint.cold.6+0x16/0x16
[   38.581464]  [<ffffffff81421f66>] ? __warn.cold.9+0xa6/0x17f
[   38.587264]  [<ffffffff83427758>] ? inet_sock_destruct+0x598/0x760
[   38.593583]  [<ffffffff81421f81>] __warn.cold.9+0xc1/0x17f
[   38.599473]  [<ffffffff836c027f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   38.605978]  [<ffffffff8113683c>] warn_slowpath_null+0x2c/0x40
[   38.611959]  [<ffffffff83427758>] inet_sock_destruct+0x598/0x760
[   38.618127]  [<ffffffff834271c0>] ? ipv4_mib_init_net+0x570/0x570
[   38.624505]  [<ffffffff836c0ac9>] l2tp_tunnel_destruct+0x339/0x590
[   38.630883]  [<ffffffff836c093a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   38.637497]  [<ffffffff836c0790>] ? l2tp_tunnel_del_work+0x470/0x470
[   38.644183]  [<ffffffff830230f5>] __sk_destruct+0x55/0x590
[   38.649988]  [<ffffffff812877ce>] rcu_process_callbacks+0x8ae/0x12b0
[   38.656610]  [<ffffffff812878ae>] ? rcu_process_callbacks+0x98e/0x12b0
[   38.663416]  [<ffffffff830230a0>] ? sock_set_timeout+0x210/0x210
[   38.669585]  [<ffffffff83a038bb>] __do_softirq+0x20b/0x937
[   38.675216]  [<ffffffff8114b277>] irq_exit+0x147/0x190
[   38.680622]  [<ffffffff83a024a1>] smp_apic_timer_interrupt+0x81/0xa0
[   38.687279]  [<ffffffff839fe630>] apic_timer_interrupt+0xa0/0xb0
[   38.693531]  <EOI> [   38.695609]  [<ffffffff839fb8d6>] ? native_safe_halt+0x6/0x10
[   38.701545]  [<ffffffff839faf15>] default_idle+0x55/0x360
[   38.707112]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   38.712978]  [<ffffffff839fbd35>] default_idle_call+0x45/0x60
[   38.718863]  [<ffffffff812231b5>] cpu_startup_entry+0x2b5/0x380
[   38.725007]  [<ffffffff81222f00>] ? cpu_in_idle+0x20/0x20
[   38.730552]  [<ffffffff839e8b9c>] rest_init+0x183/0x189
[   38.736051]  [<ffffffff84c97943>] start_kernel+0x67e/0x6b2
[   38.741672]  [<ffffffff84c972c5>] ? thread_stack_cache_init+0xb/0xb
[   38.748354]  [<ffffffff81ee37a2>] ? x86_family+0x32/0x40
[   38.753927]  [<ffffffff84c96120>] ? early_idt_handler_array+0x120/0x120
[   38.760818]  [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b
[   38.767564]  [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162
[   38.774483] Dumping ftrace buffer:
[   38.778147]    (ftrace buffer empty)
[   38.781856] Kernel Offset: disabled
[   38.785679] Rebooting in 86400 seconds..