Description:
------------
Apache child seg faults when calling the mhash() function from a PHP script. 

PHP 4.3.6, 4.3.5, 4.2.2
mhash 0.8.18 and 0.9.1

If I enable debug mode to generate a backtrace it doesn't seg fault, but the script below gives 000...0000 as a result, so I generated the backgrace without debug enabled.

This works using the php binary, just seg faults when called from within apache.


Reproduce code:
---------------
<?php

$str = "test string!";
echo bin2hex(mhash(MHASH_MD5, $str));

?>


Expected result:
----------------
[root@server httpdocs]# php -q mhash.php
cff1fa7b32de5979c35874350570dd74


Actual result:
--------------
#0  0xb719ecd9 in _int_free () from /lib/tls/libc.so.6
#1  0xb719dc88 in free () from /lib/tls/libc.so.6
#2  0xb6544171 in mhash_deinit (td=0xb7262720, result=0x839d948) at mhash.c:366
#3  0xb65441d3 in mhash_end_m (td=0x839d8e8, hash_malloc=0xb719da80 <malloc>) at mhash.c:384
#4  0xb6544201 in mhash_end (td=0x839d8c0) at mhash.c:391
#5  0xb65623a8 in zif_mhash () from /usr/lib/php4/mhash.so
#6  0xb6e0e788 in execute () from /etc/httpd/modules/libphp4.so
#7  0xb6dffe76 in zend_execute_scripts () from /etc/httpd/modules/libphp4.so
#8  0xb6dd46b4 in php_execute_script () from /etc/httpd/modules/libphp4.so