Description:
------------
Originally this was happening at the end of PEAR::Auth's constructor when it points it's storage object's '_auth_obj' variable to itself ($this).  I've created a simpler example that still crashes either Apache 1.3.29 or 2.0.48, but in the simpler case it doesn't crash Apache until the second time you run the script.

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

class Class1
{
    var $_Class2_obj;
}

class Class2
{
    var $storage = '';

    function Class2()
    {
        $this->storage = new Class1();

        $this->storage->_Class2_obj = $this;
    }
}

$foo = new Class2();

?>

Expected result:
----------------
No output, but no crash either.

Actual result:
--------------
Apache crashes