--- old/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-04-25 22:41:17.441503065 +0800
+++ new/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-04-25 22:41:17.265503849 +0800
@@ -247,6 +247,9 @@
   _heap.object_iterate(cl, true /* visit_weaks */);
 }
 
+Tickspan ZCollectedHeap::run_task(AbstractGangTask* task) {
+  return _heap.run_task(task);
+}
 void ZCollectedHeap::keep_alive(oop obj) {
   _heap.keep_alive(obj);
 }