--- old/src/hotspot/share/gc/cms/parNewGeneration.cpp	2018-06-11 15:58:44.385585016 +0200
+++ new/src/hotspot/share/gc/cms/parNewGeneration.cpp	2018-06-11 15:58:44.090574877 +0200
@@ -591,8 +591,13 @@
     _young_old_boundary(young_old_boundary),
     _state_set(state_set),
     _strong_roots_scope(strong_roots_scope),
-    _par_state_string(StringTable::weak_storage())
-{}
+    _par_state_string(StringTable::weak_storage()) {
+  StringTable::reset_dead_counter();
+}
+
+ParNewGenTask::~ParNewGenTask() {
+  StringTable::finish_dead_counter();
+}
 
 void ParNewGenTask::work(uint worker_id) {
   CMSHeap* heap = CMSHeap::heap();