Description:
------------
Call the script foo.bar, host it with apache2 on localhost and use ab to call the script concurrently:

ab -c 20 -n 10000 'http://127.0.0.1/foo.php'

Tail the output of /var/log/apache2/*.log



Test script:
---------------
<?php

class Bar
{
    const FOO = [
        'foo' => 'bar',
    ];

    public function foo($bar)
    {
        return self::FOO[$bar];
    }
}

$foo = new Bar;
usleep(rand(1,1000000));
$bar = $foo->foo('foo');

Expected result:
----------------
status 200 / no segfaults

Actual result:
--------------
A segfault and segfaults to any subsequent requests to the same script.

[Mon Oct 26 17:07:39 2015] [error] [client 127.0.0.1] PHP Fatal error:  Out of memory (allocated 262144) (tried to allocate 139794773411952 bytes) in Unknown on line 0
[Mon Oct 26 17:07:39 2015] [notice] child pid 7385 exit signal Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7386 exit signal Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7390 exit signal Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7391 exit signal Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7392 exit signal Segmentation fault (11)