--- a/src/hotspot/share/gc/parallel/psMarkSweep.cpp	Mon May 07 16:12:07 2018 +0200
+++ b/src/hotspot/share/gc/parallel/psMarkSweep.cpp	Mon May 07 16:16:17 2018 +0200
@@ -71,6 +71,7 @@
   _span_based_discoverer.set_span(ParallelScavengeHeap::heap()->reserved_region());
   set_ref_processor(new ReferenceProcessor(&_span_based_discoverer));     // a vanilla ref proc
   _counters = new CollectorCounters("PSMarkSweep", 1);
+  MarkSweep::initialize();
 }
 
 // This method contains all heap specific policy for invoking mark sweep.