src/share/vm/gc/shared/genCollectedHeap.cpp

*** 1087,1096 ****
--- 1087,1098 ----
    log_debug(gc, verify)("RemSet");
    rem_set()->verify();
  }
  
  void GenCollectedHeap::print_on(outputStream* st) const {
+   assert_locked_or_safepoint(Heap_lock);
+ 
    _young_gen->print_on(st);
    _old_gen->print_on(st);
    MetaspaceAux::print_on(st);
  }