Description:
------------
I installed the latest snapshot of PHP 5.2.0-dev compilen 2006-11-22.
Sometimes (not always) preg_match_all couses the "Segmentation fault" error while processing some content.

Reproduce code:
---------------
<?php
echo "Start\n";

// preg_match_all crashes on this file
$content = file_get_contents("http://makl.ru/content.txt");

// Regexp
$pattern="/<form[^<>]*>((.(?!\/form>))+)<\/form>/si";

$res = array();
preg_match_all($pattern,$content,$res);

echo "\n\nDone!";
var_dump($res);

?>

Expected result:
----------------
Expecting the part of text from content.txt between
<form> ... </form> tags.

Actual result:
--------------
Start
Segmentation fault