Description:
------------
Hello PHP team,
I managed to pin-point one problem with PHP 7.0.4 (But I think that this problem is at least from 7.0.0)

I don't think that there is more to explain than simple code below.

Originally I found this problem in our large PHP code and it disappeared every time I turned off Opcache, but after pin-pointing and extracting problem into code below: Opcache is no longer needed to segfault (so I guess that opcache is maybe little more sensitive to this kind of bad PHP code abuse)

My system spec:
PHP version: 7.0.4
OS: CentOS 7.2.1511
RAM: 128 GB
CPU: 2 x Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz

PHP config:
Memory limit: 16 GB

Test script:
---------------
<?php
$desc = array();
for ($i = 65535; $i > 0; $i--)
{
	$desc[$i] = &$desc[$i - 1]; 
}
echo "still ok\n";
$desc = array();
for ($i = 65536; $i > 0; $i--)
{
	$desc[$i] = &$desc[$i - 1]; 
}
echo "not ok";

Expected result:
----------------
still ok
not ok

Actual result:
--------------
still ok
Segmentation fault