diff -r 70649f10b88c -r 047a642c9729 src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Tue Dec 15 09:46:51 2015 +0100
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed Dec 02 13:58:34 2015 +0530
@@ -2331,6 +2331,7 @@
     case GCCause::_java_lang_system_gc:     return ExplicitGCInvokesConcurrent;
     case GCCause::_g1_humongous_allocation: return true;
     case GCCause::_update_allocation_context_stats_inc: return true;
+    case GCCause::_wb_conc_mark:            return true;
     default:                                return false;
   }
 }