--- a/src/hotspot/share/gc/z/zMark.cpp	Fri Aug 23 08:48:18 2019 +0200
+++ b/src/hotspot/share/gc/z/zMark.cpp	Fri Aug 23 08:48:23 2019 +0200
@@ -156,7 +156,7 @@
   ZMarkRootsTask(ZMark* mark) :
       ZTask("ZMarkRootsTask"),
       _mark(mark),
-      _roots() {}
+      _roots(true /* visit_invisible */, false /* visit_jvmti_weak_export */) {}
 
   virtual void work() {
     _roots.oops_do(&_cl);