--- old/test/jdk/com/sun/jdi/TestScaffold.java	2018-10-17 12:32:53.156511684 -0400
+++ new/test/jdk/com/sun/jdi/TestScaffold.java	2018-10-17 12:32:52.724486453 -0400
@@ -542,7 +542,9 @@
                                 redefine(mainStartClass);
                             }
                         } else {
-                            redefine(rt);
+                            if (!name.startsWith("jdk.")) {
+                                redefine(rt);
+                            }
                         }
                     }
                 }