--- old/src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp	2017-10-16 09:38:38.659046295 -0400
+++ new/src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp	2017-10-16 09:38:37.984228537 -0400
@@ -7957,7 +7957,7 @@
   }
 #ifndef PRODUCT
   assert(_num_par_pushes >= n, "Too many pops?");
-  Atomic::add(-n, &_num_par_pushes);
+  Atomic::sub(n, &_num_par_pushes);
 #endif
   return true;
 }