Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 12940)
+++ wp-includes/comment-template.php	(working copy)
@@ -750,13 +750,13 @@
 				xmlns:dc="http://purl.org/dc/elements/1.1/"
 				xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
 			<rdf:Description rdf:about="';
-		the_permalink();
+		str_replace('--', '&#45;&#45;', the_permalink());
 		echo '"'."\n";
 		echo '    dc:identifier="';
-		the_permalink();
+		str_replace('--', '&#45;&#45;', the_permalink());
 		echo '"'."\n";
 		echo '    dc:title="'.str_replace('--', '&#x2d;&#x2d;', wptexturize(strip_tags(get_the_title()))).'"'."\n";
-		echo '    trackback:ping="'.get_trackback_url().'"'." />\n";
+		echo '    trackback:ping="'.str_replace('--', '&#45;&#45;', get_trackback_url()).'"'." />\n";
 		echo '</rdf:RDF>';
 	}
 }