Description:
------------
reproduced on:
php 5.3.10
php 5.4.6

Test script:
---------------
$text = file_get_contents('http://dl.dropbox.com/u/31119503/php_segfault/data.txt');
preg_match('/(?:^.*$\n*)+/mx', $text);

Expected result:
----------------
preg_match return false

Actual result:
--------------
Segmentation fault (core dumped)