--- old/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	2015-02-03 11:18:17.997415635 +0100
+++ new/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	2015-02-03 11:18:17.926413585 +0100
@@ -420,6 +420,7 @@
   ReservedSpace bot_rs(G1BlockOffsetSharedArray::compute_size(heap.word_size()));
   G1RegionToSpaceMapper* bot_storage =
     G1RegionToSpaceMapper::create_mapper(bot_rs,
+                                         bot_rs.size(),
                                          os::vm_page_size(),
                                          HeapRegion::GrainBytes,
                                          G1BlockOffsetSharedArray::N_bytes,