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

*** 21,31 ****
      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));
          if (page == null) {
              throw new RuntimeException("Address not in pageTable: " + zOffset);
          }
          return page;
      }
--- 21,31 ----
      private ZPage getPage(long zOffset) {
          if (zOffset > ZGlobals.ZAddressOffsetMask) {
              throw new RuntimeException("Not a Z offset: " + zOffset);
          }
  
!         ZPage page = pageTable.get(ZUtils.longToAddress(zOffset));
          if (page == null) {
              throw new RuntimeException("Address not in pageTable: " + zOffset);
          }
          return page;
      }