--- a/src/hotspot/share/jfr/leakprofiler/checkpoint/rootResolver.cpp	Tue Oct 16 13:14:18 2018 +0200
+++ b/src/hotspot/share/jfr/leakprofiler/checkpoint/rootResolver.cpp	Tue Oct 16 13:16:11 2018 +0200
@@ -128,7 +128,7 @@
 bool ReferenceToRootClosure::do_cldg_roots() {
   assert(!complete(), "invariant");
   ReferenceLocateClosure rlc(_callback, OldObjectRoot::_class_loader_data, OldObjectRoot::_type_undetermined, NULL);
-  CLDToOopClosure cldt_closure(&rlc);
+  CLDToOopClosure cldt_closure(&rlc, ClassLoaderData::_claim_strong);
   ClassLoaderDataGraph::always_strong_cld_do(&cldt_closure);
   return rlc.complete();
 }