[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.689484] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.570641] random: sshd: uninitialized urandom read (32 bytes read)
[   18.878116] random: sshd: uninitialized urandom read (32 bytes read)
[   19.711235] random: sshd: uninitialized urandom read (32 bytes read)
[   19.858057] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts.
[   25.272132] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   25.450147] ------------[ cut here ]------------
[   25.454961] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   25.463462] Kernel panic - not syncing: panic_on_warn set ...
[   25.463462] 
[   25.470821] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.111-g03c70fe #57
[   25.477816] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   25.487157]  ffff8801db207cc0 ffffffff81eb2729 ffffffff83c48980 00000000ffffffff
[   25.495176]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   25.503164]  ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836
[   25.511174] Call Trace:
[   25.513741]  <IRQ> [   25.515791]  [<ffffffff81eb2729>] dump_stack+0xc1/0x128
[   25.521151]  [<ffffffff814219f5>] panic+0x1bf/0x3bc
[   25.526167]  [<ffffffff81421836>] ? add_taint.cold.6+0x16/0x16
[   25.532139]  [<ffffffff81421cc6>] ? __warn.cold.9+0xa6/0x17f
[   25.537923]  [<ffffffff83423bc8>] ? inet_sock_destruct+0x598/0x760
[   25.544247]  [<ffffffff81421ce1>] __warn.cold.9+0xc1/0x17f
[   25.549851]  [<ffffffff836bc31f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   25.556327]  [<ffffffff811367dc>] warn_slowpath_null+0x2c/0x40
[   25.562278]  [<ffffffff83423bc8>] inet_sock_destruct+0x598/0x760
[   25.568403]  [<ffffffff83423630>] ? ipv4_mib_init_net+0x570/0x570
[   25.574613]  [<ffffffff836bcb69>] l2tp_tunnel_destruct+0x339/0x590
[   25.580908]  [<ffffffff836bc9da>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   25.587380]  [<ffffffff836bc830>] ? l2tp_tunnel_del_work+0x470/0x470
[   25.593865]  [<ffffffff83020095>] __sk_destruct+0x55/0x590
[   25.599471]  [<ffffffff8128776e>] rcu_process_callbacks+0x8ae/0x12b0
[   25.605949]  [<ffffffff8128784e>] ? rcu_process_callbacks+0x98e/0x12b0
[   25.612605]  [<ffffffff83020040>] ? sock_set_timeout+0x210/0x210
[   25.618739]  [<ffffffff839ff8bb>] __do_softirq+0x20b/0x937
[   25.624356]  [<ffffffff8114b237>] irq_exit+0x147/0x190
[   25.629625]  [<ffffffff839fe4a1>] smp_apic_timer_interrupt+0x81/0xa0
[   25.636100]  [<ffffffff839fa630>] apic_timer_interrupt+0xa0/0xb0
[   25.642222]  <EOI> [   25.644267]  [<ffffffff839f78f6>] ? native_safe_halt+0x6/0x10
[   25.650150]  [<ffffffff839f6f35>] default_idle+0x55/0x360
[   25.655668]  [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20
[   25.661183]  [<ffffffff839f7d55>] default_idle_call+0x45/0x60
[   25.667055]  [<ffffffff81223195>] cpu_startup_entry+0x2b5/0x380
[   25.673261]  [<ffffffff81222ee0>] ? cpu_in_idle+0x20/0x20
[   25.678792]  [<ffffffff839e4bbc>] rest_init+0x183/0x189
[   25.684140]  [<ffffffff84c97943>] start_kernel+0x67e/0x6b2
[   25.689748]  [<ffffffff84c972c5>] ? thread_stack_cache_init+0xb/0xb
[   25.696153]  [<ffffffff81ee12e2>] ? x86_family+0x32/0x40
[   25.701593]  [<ffffffff84c96120>] ? early_idt_handler_array+0x120/0x120
[   25.708332]  [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b
[   25.714901]  [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162
[   25.721832] Dumping ftrace buffer:
[   25.725452]    (ftrace buffer empty)
[   25.729155] Kernel Offset: disabled
[   25.732781] Rebooting in 86400 seconds..