diff -r f0312c7d5b37 -r ba6c248cae19 src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/ObjectHeap.java
--- a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/ObjectHeap.java	Wed Nov 13 11:21:15 2019 +0100
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/ObjectHeap.java	Wed Nov 13 11:37:29 2019 +0100
@@ -32,7 +32,6 @@
 import java.util.*;
 
 import sun.jvm.hotspot.debugger.*;
-import sun.jvm.hotspot.gc.cms.*;
 import sun.jvm.hotspot.gc.shared.*;
 import sun.jvm.hotspot.gc.epsilon.*;
 import sun.jvm.hotspot.gc.g1.*;
@@ -234,16 +233,11 @@
     }
     visitor.prologue(totalSize);
 
-    CompactibleFreeListSpace cmsSpaceOld = null;
     CollectedHeap heap = VM.getVM().getUniverse().heap();
 
     if (heap instanceof GenCollectedHeap) {
       GenCollectedHeap genHeap = (GenCollectedHeap) heap;
       Generation genOld = genHeap.getGen(1);
-      if (genOld instanceof ConcurrentMarkSweepGeneration) {
-          ConcurrentMarkSweepGeneration concGen = (ConcurrentMarkSweepGeneration)genOld;
-          cmsSpaceOld = concGen.cmsSpace();
-      }
     }
 
     for (int i = 0; i < liveRegions.size(); i += 2) {
@@ -265,20 +259,7 @@
             }
           }
           if (obj == null) {
-             //Find the object size using Printezis bits and skip over
-             long size = 0;
-
-             if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle) ){
-                 size = cmsSpaceOld.collector().blockSizeUsingPrintezisBits(handle);
-             }
-
-             if (size <= 0) {
-                //Either Printezis bits not set or handle is not in cms space.
-                throw new UnknownOopException();
-             }
-
-             handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(size));
-             continue;
+              throw new UnknownOopException();
           }
           if (of == null || of.canInclude(obj)) {
                   if (visitor.doObj(obj)) {
@@ -286,11 +267,8 @@
                           break;
                   }
           }
-          if ( (cmsSpaceOld != null) && cmsSpaceOld.contains(handle)) {
-              handle = handle.addOffsetToAsOopHandle(CompactibleFreeListSpace.adjustObjectSizeInBytes(obj.getObjectSize()) );
-          } else {
-              handle = handle.addOffsetToAsOopHandle(obj.getObjectSize());
-          }
+
+          handle = handle.addOffsetToAsOopHandle(obj.getObjectSize());
         }
       }
       catch (AddressException e) {