Description:
------------
PHP segfault when I use the DOM attribute ownerDocument in a PHP object. See the code for what happened.

I try with the command line : 
/opt/php5/bin/php -q my_file.php

I use a Debian GNU/Linux unstable with PHP 5.0.0, but I had also the problem with PHP 5.0.0RC3. Here is my version of libxml2 :

ii  libxml2        2.6.11-1       GNOME XML library
ii  libxml2-dev    2.6.11-1       Development files for the GNOME XML library

I compile PHP with the following configure line :
./compile --with-prefix=/opt/php5 --with-xsl --with-mysql

Thanks

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

class XMLReader {


	public $doc = NULL ;


	public function __construct($xml) {
		
		$dom = new DOMDocument() ;
		$dom->loadXML($xml) ;
		$this->doc = $dom->documentElement ;
		
	}
	
	
	public function owner() {
	
		return get_class($this->doc->ownerDocument) ;
		
	}
	
}

$dom = new DOMDocument() ;
$dom->loadXML('<test>This is a test</test>') ;
$docElt = $dom->documentElement ;
echo get_class($docElt->ownerDocument) ; // no segfault

$xml = new XMLReader('<test>This is a test</test>') ;
echo get_class($xml->doc->ownerDocument) ; //segfault

$xml = new XMLReader('<test>This is a test</test>') ;
echo get_class($xml->owner()) ; //segfault


?>