src/share/vm/services/diagnosticCommand.cpp

@@ -411,10 +411,11 @@
                          vmSymbols::run_finalization_name(),
                          vmSymbols::void_method_signature(), CHECK);
 }
 
 void HeapInfoDCmd::execute(DCmdSource source, TRAPS) {
+  MutexLocker hl(Heap_lock);
   Universe::heap()->print_on(output());
 }
 
 void FinalizerInfoDCmd::execute(DCmdSource source, TRAPS) {
   ResourceMark rm;