[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.348581] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   18.869562] random: sshd: uninitialized urandom read (32 bytes read)
[   19.331634] random: sshd: uninitialized urandom read (32 bytes read)
[   20.155177] random: sshd: uninitialized urandom read (32 bytes read)
[   20.288200] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts.
[   25.734474] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   25.914876] ------------[ cut here ]------------
[   25.919679] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   25.928152] Kernel panic - not syncing: panic_on_warn set ...
[   25.928152] 
[   25.935486] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.110-g00a0bcb #4
[   25.942382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   25.951709]  ffff8801db207cc0 ffffffff81eb2329 ffffffff83c48960 00000000ffffffff
[   25.959693]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   25.967674]  ffffffff81421925 0000000041b58ab3 ffffffff843ba880 ffffffff81421766
[   25.975669] Call Trace:
[   25.978221]  <IRQ> [   25.980268]  [<ffffffff81eb2329>] dump_stack+0xc1/0x128
[   25.985624]  [<ffffffff81421925>] panic+0x1bf/0x3bc
[   25.990621]  [<ffffffff81421766>] ? add_taint.cold.6+0x16/0x16
[   25.996574]  [<ffffffff81421bf6>] ? __warn.cold.9+0xa6/0x17f
[   26.002345]  [<ffffffff83422bc8>] ? inet_sock_destruct+0x598/0x760
[   26.008635]  [<ffffffff81421c11>] __warn.cold.9+0xc1/0x17f
[   26.014236]  [<ffffffff836bb31f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   26.020701]  [<ffffffff811367cc>] warn_slowpath_null+0x2c/0x40
[   26.026644]  [<ffffffff83422bc8>] inet_sock_destruct+0x598/0x760
[   26.032758]  [<ffffffff83422630>] ? ipv4_mib_init_net+0x570/0x570
[   26.038961]  [<ffffffff836bbb69>] l2tp_tunnel_destruct+0x339/0x590
[   26.045249]  [<ffffffff836bb9da>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   26.051711]  [<ffffffff836bb830>] ? l2tp_tunnel_del_work+0x470/0x470
[   26.058175]  [<ffffffff8301f095>] __sk_destruct+0x55/0x590
[   26.063773]  [<ffffffff8128769e>] rcu_process_callbacks+0x8ae/0x12b0
[   26.070244]  [<ffffffff8128777e>] ? rcu_process_callbacks+0x98e/0x12b0
[   26.076880]  [<ffffffff8301f040>] ? sock_set_timeout+0x210/0x210
[   26.083006]  [<ffffffff839fe8bb>] __do_softirq+0x20b/0x937
[   26.088603]  [<ffffffff8114b227>] irq_exit+0x147/0x190
[   26.093849]  [<ffffffff839fd4a1>] smp_apic_timer_interrupt+0x81/0xa0
[   26.100313]  [<ffffffff839f9630>] apic_timer_interrupt+0xa0/0xb0
[   26.106428]  <EOI> [   26.108467]  [<ffffffff839f68f6>] ? native_safe_halt+0x6/0x10
[   26.114342]  [<ffffffff839f5f35>] default_idle+0x55/0x360
[   26.119849]  [<ffffffff8106ad10>] arch_cpu_idle+0x10/0x20
[   26.125359]  [<ffffffff839f6d55>] default_idle_call+0x45/0x60
[   26.131233]  [<ffffffff81223185>] cpu_startup_entry+0x2b5/0x380
[   26.137262]  [<ffffffff81222ed0>] ? cpu_in_idle+0x20/0x20
[   26.142778]  [<ffffffff839e3bbc>] rest_init+0x183/0x189
[   26.148420]  [<ffffffff84c97943>] start_kernel+0x67e/0x6b2
[   26.154017]  [<ffffffff84c972c5>] ? thread_stack_cache_init+0xb/0xb
[   26.160396]  [<ffffffff81ee0ee2>] ? x86_family+0x32/0x40
[   26.165819]  [<ffffffff84c96120>] ? early_idt_handler_array+0x120/0x120
[   26.172552]  [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b
[   26.179101]  [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162
[   26.185884] Dumping ftrace buffer:
[   26.189437]    (ftrace buffer empty)
[   26.193118] Kernel Offset: disabled
[   26.196724] Rebooting in 86400 seconds..