--- old/src/hotspot/share/gc/z/zCollectedHeap.cpp	2019-05-29 11:25:00.295627478 +0200
+++ new/src/hotspot/share/gc/z/zCollectedHeap.cpp	2019-05-29 11:25:00.053619876 +0200
@@ -109,7 +109,7 @@
 }
 
 bool ZCollectedHeap::is_in(const void* p) const {
-  return is_in_reserved(p) && _heap.is_in((uintptr_t)p);
+  return _heap.is_in((uintptr_t)p);
 }
 
 uint32_t ZCollectedHeap::hash_oop(oop obj) const {