diff -r 82f545c6572b -r a67a581cfe11 hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp
--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp	Thu Mar 12 15:51:12 2015 -0700
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp	Mon Feb 16 14:07:36 2015 +0100
@@ -324,9 +324,8 @@
 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark,
                                                   bool during_conc_mark,
                                                   size_t marked_bytes) {
-  assert(0 <= marked_bytes && marked_bytes <= used(),
-         err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT,
-                 marked_bytes, used()));
+  assert(marked_bytes <= used(),
+         err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, marked_bytes, used()));
   _prev_top_at_mark_start = top();
   _prev_marked_bytes = marked_bytes;
 }