--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Thu Feb 05 11:42:10 2009 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Fri Feb 06 01:38:50 2009 +0300
@@ -566,7 +566,11 @@
   void note_end_of_copying() {
     assert(top() >= _next_top_at_mark_start,
            "Increase only");
-    _next_top_at_mark_start = top();
+    // Survivor regions will be scanned on the start of concurrent
+    // marking.
+    if (!is_survivor()) {
+      _next_top_at_mark_start = top();
+    }
   }
 
   // Returns "false" iff no object in the region was allocated when the