src/share/vm/services/diagnosticCommand.cpp

*** 411,420 ****
--- 411,421 ----
                           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;