src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZExternalBitMap.java

@@ -45,11 +45,11 @@
     private ZPage getPage(long zOffset) {
         if (zOffset > ZGlobals.ZAddressOffsetMask) {
             throw new RuntimeException("Not a Z offset: " + zOffset);
         }
 
-        ZPage page = pageTable.get(ZOop.to_address(zOffset));
+        ZPage page = pageTable.get(ZUtils.longToAddress(zOffset));
         if (page == null) {
             throw new RuntimeException("Address not in pageTable: " + zOffset);
         }
         return page;
     }