--- old/agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java	Thu Sep 17 16:09:24 2009
+++ new/agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java	Thu Sep 17 16:09:24 2009
@@ -167,7 +167,8 @@
     CodeBlob lastBlob = null;
     while (ptr != null && ptr.lessThan(end)) {
       try {
-        CodeBlob blob = findBlobUnsafe(ptr);
+        // Use findStart to get a pointer inside blob other findBlob asserts
+        CodeBlob blob = findBlobUnsafe(heap.findStart(ptr));
         if (blob != null) {
           visitor.visit(blob);
           if (blob == lastBlob) {