--- old/src/hotspot/share/classfile/classLoaderDataGraph.cpp	2018-10-29 23:13:07.890228281 -0400
+++ new/src/hotspot/share/classfile/classLoaderDataGraph.cpp	2018-10-29 23:13:07.674228270 -0400
@@ -580,7 +580,7 @@
 }
 
 void ClassLoaderDataGraph::purge() {
-  assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
+  assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
   ClassLoaderData* list = _unloading;
   _unloading = NULL;
   ClassLoaderData* next = list;