[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.772192] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   17.467987] random: sshd: uninitialized urandom read (32 bytes read)
[   17.961173] random: sshd: uninitialized urandom read (32 bytes read)
[   18.883950] random: sshd: uninitialized urandom read (32 bytes read)
[   19.023832] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts.
[   24.512492] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   24.729253] ------------[ cut here ]------------
[   24.734062] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   24.742578] Kernel panic - not syncing: panic_on_warn set ...
[   24.742578] 
[   24.749919] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.112-g9e79039 #7
[   24.756826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   24.766173]  ffff8801db307cc0 ffffffff81eb3249 ffffffff83c48980 00000000ffffffff
[   24.774168]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   24.782180]  ffffffff81421a55 0000000041b58ab3 ffffffff843bae78 ffffffff81421896
[   24.790204] Call Trace:
[   24.792772]  <IRQ> [   24.794823]  [<ffffffff81eb3249>] dump_stack+0xc1/0x128
[   24.800188]  [<ffffffff81421a55>] panic+0x1bf/0x3bc
[   24.805193]  [<ffffffff81421896>] ? add_taint.cold.6+0x16/0x16
[   24.811158]  [<ffffffff81421d26>] ? __warn.cold.9+0xa6/0x17f
[   24.816939]  [<ffffffff83424cc8>] ? inet_sock_destruct+0x598/0x760
[   24.823233]  [<ffffffff81421d41>] __warn.cold.9+0xc1/0x17f
[   24.828849]  [<ffffffff836bd59f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   24.835325]  [<ffffffff8113683c>] warn_slowpath_null+0x2c/0x40
[   24.841298]  [<ffffffff83424cc8>] inet_sock_destruct+0x598/0x760
[   24.847429]  [<ffffffff83424730>] ? ipv4_mib_init_net+0x570/0x570
[   24.853643]  [<ffffffff836bdde9>] l2tp_tunnel_destruct+0x339/0x590
[   24.859937]  [<ffffffff836bdc5a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   24.866407]  [<ffffffff836bdab0>] ? l2tp_tunnel_del_work+0x470/0x470
[   24.872883]  [<ffffffff83021095>] __sk_destruct+0x55/0x590
[   24.878489]  [<ffffffff812877ce>] rcu_process_callbacks+0x8ae/0x12b0
[   24.884965]  [<ffffffff812878ae>] ? rcu_process_callbacks+0x98e/0x12b0
[   24.891613]  [<ffffffff83021040>] ? sock_set_timeout+0x210/0x210
[   24.897744]  [<ffffffff83a00b3b>] __do_softirq+0x20b/0x937
[   24.903357]  [<ffffffff8114b297>] irq_exit+0x147/0x190
[   24.908619]  [<ffffffff839ff721>] smp_apic_timer_interrupt+0x81/0xa0
[   24.915106]  [<ffffffff839fb8b0>] apic_timer_interrupt+0xa0/0xb0
[   24.921229]  <EOI> [   24.923274]  [<ffffffff839f8b86>] ? native_safe_halt+0x6/0x10
[   24.929154]  [<ffffffff81235c6d>] ? trace_hardirqs_on+0xd/0x10
[   24.935097]  [<ffffffff839f81c5>] default_idle+0x55/0x360
[   24.940625]  [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20
[   24.946147]  [<ffffffff839f8fe5>] default_idle_call+0x45/0x60
[   24.952005]  [<ffffffff812231f5>] cpu_startup_entry+0x2b5/0x380
[   24.958044]  [<ffffffff81222f40>] ? cpu_in_idle+0x20/0x20
[   24.963557]  [<ffffffff810aefa8>] start_secondary+0x328/0x400
[   24.969417]  [<ffffffff810aec80>] ? set_cpu_sibling_map+0x1300/0x1300
[   24.976579] Dumping ftrace buffer:
[   24.980166]    (ftrace buffer empty)
[   24.983851] Kernel Offset: disabled
[   24.987460] Rebooting in 86400 seconds..