[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   11.707565] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.508424] random: sshd: uninitialized urandom read (32 bytes read)
[   26.923358] random: sshd: uninitialized urandom read (32 bytes read)
[   27.462157] random: sshd: uninitialized urandom read (32 bytes read)
[   27.586070] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts.
[   33.036742] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   33.215731] ------------[ cut here ]------------
[   33.220545] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   33.229027] Kernel panic - not syncing: panic_on_warn set ...
[   33.229027] 
[   33.236362] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.101-gaef17a5 #29
[   33.243379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.252710]  ffff8801db207cc0 ffffffff81eb1009 ffffffff83c484a0 00000000ffffffff
[   33.260692]  0000000000000000 0000000000000000 00000000000000a7 ffff8801db207d80
[   33.268693]  ffffffff8141f925 0000000041b58ab3 ffffffff843b87e8 ffffffff8141f766
[   33.276680] Call Trace:
[   33.279235]  <IRQ> [   33.281276]  [<ffffffff81eb1009>] dump_stack+0xc1/0x128
[   33.286630]  [<ffffffff8141f925>] panic+0x1bf/0x3bc
[   33.291621]  [<ffffffff8141f766>] ? add_taint.cold.6+0x16/0x16
[   33.297565]  [<ffffffff8141fbf6>] ? __warn.cold.9+0xa6/0x17f
[   33.303339]  [<ffffffff83420018>] ? inet_sock_destruct+0x598/0x760
[   33.309630]  [<ffffffff8141fc11>] __warn.cold.9+0xc1/0x17f
[   33.315239]  [<ffffffff836b813f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   33.321720]  [<ffffffff8113461c>] warn_slowpath_null+0x2c/0x40
[   33.327661]  [<ffffffff83420018>] inet_sock_destruct+0x598/0x760
[   33.333791]  [<ffffffff8341fa80>] ? ipv4_mib_init_net+0x570/0x570
[   33.340010]  [<ffffffff836b8989>] l2tp_tunnel_destruct+0x339/0x590
[   33.346311]  [<ffffffff836b87fa>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   33.352774]  [<ffffffff836b8650>] ? l2tp_tunnel_del_work+0x470/0x470
[   33.359247]  [<ffffffff8301d095>] __sk_destruct+0x55/0x590
[   33.364854]  [<ffffffff812857ce>] rcu_process_callbacks+0x8ae/0x12b0
[   33.371316]  [<ffffffff812858ae>] ? rcu_process_callbacks+0x98e/0x12b0
[   33.377954]  [<ffffffff8301d040>] ? sock_set_timeout+0x210/0x210
[   33.384072]  [<ffffffff839fb47b>] __do_softirq+0x20b/0x937
[   33.389668]  [<ffffffff81149077>] irq_exit+0x147/0x190
[   33.394916]  [<ffffffff839fa061>] smp_apic_timer_interrupt+0x81/0xa0
[   33.401387]  [<ffffffff839f61f0>] apic_timer_interrupt+0xa0/0xb0
[   33.407502]  <EOI> [   33.409542]  [<ffffffff839f34c6>] ? native_safe_halt+0x6/0x10
[   33.415414]  [<ffffffff839f2b05>] default_idle+0x55/0x360
[   33.420943]  [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20
[   33.426452]  [<ffffffff839f3925>] default_idle_call+0x45/0x60
[   33.432308]  [<ffffffff81220ea5>] cpu_startup_entry+0x2b5/0x380
[   33.438338]  [<ffffffff81220bf0>] ? cpu_in_idle+0x20/0x20
[   33.443846]  [<ffffffff839e078c>] rest_init+0x183/0x189
[   33.449180]  [<ffffffff84c97943>] start_kernel+0x67e/0x6b2
[   33.454774]  [<ffffffff84c972c5>] ? thread_stack_cache_init+0xb/0xb
[   33.461151]  [<ffffffff81edfbc2>] ? x86_family+0x32/0x40
[   33.466571]  [<ffffffff84c96120>] ? early_idt_handler_array+0x120/0x120
[   33.473296]  [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b
[   33.479855]  [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162
[   33.486656] Dumping ftrace buffer:
[   33.490191]    (ftrace buffer empty)
[   33.493873] Kernel Offset: disabled
[   33.497484] Rebooting in 86400 seconds..