this script will crash apache every time.  Shorten it by a few chars and the segfault disappears.

<?php 
$string='xxx%3Bs%3A2%3A%2212%22%3Bi%3A13%3Bi%3A1%3Bi%3A17%3Bi%3A1%3Bi%3A20%3Bi%3A1%3Bi%3A11%3Bi%3A1%3Bi%3A14%3Bi%3A1%3Bi%3A15%3Bi%3A1%3Bi%3A16%3Bi%3A1%3Bi%3A21%3Bi%3A1%3Bi%3A24%3Bi%3A1%3Bi%3A23%3Bi%3A1%3Bi%3A26%3Bi%3A1%3B%7D';
SetCookie("test",$string,0);
?>
<HTML><HEAD><TITLE>bug</TITLE></HEAD>
<body>string length is:
<?php
print strlen($string);
?>
</body></html>