diff -r 4e2bff1a5467 -r b0c9cb06506b hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp
--- a/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Mon May 02 12:14:26 2016 -0400
+++ b/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Tue May 03 22:45:27 2016 +0200
@@ -5666,10 +5666,9 @@
   }
   assert(_virtual_space.committed_size() == brs.size(),
          "didn't reserve backing store for all of CMS bit map?");
-  _bm.set_map((BitMap::bm_word_t*)_virtual_space.low());
   assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >=
          _bmWordSize, "inconsistency in bit map sizing");
-  _bm.set_size(_bmWordSize >> _shifter);
+  _bm = BitMapView((BitMap::bm_word_t*)_virtual_space.low(), _bmWordSize >> _shifter);
 
   // bm.clear(); // can we rely on getting zero'd memory? verify below
   assert(isAllClear(),