--- old/src/share/vm/gc_implementation/g1/concurrentMark.hpp	2015-04-15 12:34:17.789818139 +0200
+++ new/src/share/vm/gc_implementation/g1/concurrentMark.hpp	2015-04-15 12:34:17.621812491 +0200
@@ -678,8 +678,12 @@
   ConcurrentMark(G1CollectedHeap* g1h,
                  G1RegionToSpaceMapper* prev_bitmap_storage,
                  G1RegionToSpaceMapper* next_bitmap_storage);
+
+ private:
+  // The ConcurrentMark instance is never freed.
   ~ConcurrentMark();
 
+ public:
   ConcurrentMarkThread* cmThread() { return _cmThread; }
 
   CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; }