--- old/src/share/vm/services/diagnosticCommand.cpp	2016-05-10 22:20:05.231695420 +0900
+++ new/src/share/vm/services/diagnosticCommand.cpp	2016-05-10 22:20:05.095696294 +0900
@@ -413,6 +413,7 @@
 }
 
 void HeapInfoDCmd::execute(DCmdSource source, TRAPS) {
+  MutexLocker hl(Heap_lock);
   Universe::heap()->print_on(output());
 }