[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.954239] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.868376] random: sshd: uninitialized urandom read (32 bytes read)
[   19.210022] random: sshd: uninitialized urandom read (32 bytes read)
[   20.149984] random: sshd: uninitialized urandom read (32 bytes read)
[   20.279498] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts.
[   25.762318] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   25.938623] ------------[ cut here ]------------
[   25.943405] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   25.951874] Kernel panic - not syncing: panic_on_warn set ...
[   25.951874] 
[   25.959209] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.111-g03c70fe #6
[   25.966104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   25.975429]  ffff8801db207cc0 ffffffff81eb2729 ffffffff83c48980 00000000ffffffff
[   25.983429]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   25.991406]  ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836
[   25.999378] Call Trace:
[   26.001936]  <IRQ> [   26.003976]  [<ffffffff81eb2729>] dump_stack+0xc1/0x128
[   26.009329]  [<ffffffff814219f5>] panic+0x1bf/0x3bc
[   26.014317]  [<ffffffff81421836>] ? add_taint.cold.6+0x16/0x16
[   26.020260]  [<ffffffff81421cc6>] ? __warn.cold.9+0xa6/0x17f
[   26.026032]  [<ffffffff83423bc8>] ? inet_sock_destruct+0x598/0x760
[   26.032330]  [<ffffffff81421ce1>] __warn.cold.9+0xc1/0x17f
[   26.037926]  [<ffffffff836bc31f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   26.044413]  [<ffffffff811367dc>] warn_slowpath_null+0x2c/0x40
[   26.050370]  [<ffffffff83423bc8>] inet_sock_destruct+0x598/0x760
[   26.056499]  [<ffffffff83423630>] ? ipv4_mib_init_net+0x570/0x570
[   26.062702]  [<ffffffff836bcb69>] l2tp_tunnel_destruct+0x339/0x590
[   26.068992]  [<ffffffff836bc9da>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   26.075456]  [<ffffffff836bc830>] ? l2tp_tunnel_del_work+0x470/0x470
[   26.081918]  [<ffffffff83020095>] __sk_destruct+0x55/0x590
[   26.087523]  [<ffffffff8128776e>] rcu_process_callbacks+0x8ae/0x12b0
[   26.093985]  [<ffffffff8128784e>] ? rcu_process_callbacks+0x98e/0x12b0
[   26.100620]  [<ffffffff83020040>] ? sock_set_timeout+0x210/0x210
[   26.106743]  [<ffffffff839ff8bb>] __do_softirq+0x20b/0x937
[   26.112347]  [<ffffffff8114b237>] irq_exit+0x147/0x190
[   26.117596]  [<ffffffff839fe4a1>] smp_apic_timer_interrupt+0x81/0xa0
[   26.124058]  [<ffffffff839fa630>] apic_timer_interrupt+0xa0/0xb0
[   26.130171]  <EOI> [   26.132210]  [<ffffffff839f78f6>] ? native_safe_halt+0x6/0x10
[   26.138082]  [<ffffffff839f6f35>] default_idle+0x55/0x360
[   26.143592]  [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20
[   26.149100]  [<ffffffff839f7d55>] default_idle_call+0x45/0x60
[   26.154956]  [<ffffffff81223195>] cpu_startup_entry+0x2b5/0x380
[   26.160984]  [<ffffffff81222ee0>] ? cpu_in_idle+0x20/0x20
[   26.166490]  [<ffffffff839e4bbc>] rest_init+0x183/0x189
[   26.171836]  [<ffffffff84c97943>] start_kernel+0x67e/0x6b2
[   26.177440]  [<ffffffff84c972c5>] ? thread_stack_cache_init+0xb/0xb
[   26.183816]  [<ffffffff81ee12e2>] ? x86_family+0x32/0x40
[   26.189236]  [<ffffffff84c96120>] ? early_idt_handler_array+0x120/0x120
[   26.195959]  [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b
[   26.202509]  [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162
[   26.209284] Dumping ftrace buffer:
[   26.212833]    (ftrace buffer empty)
[   26.216514] Kernel Offset: disabled
[   26.220117] Rebooting in 86400 seconds..