diff -r c2d95df2c54e -r 7cbd1b2c139b hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp
--- a/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Mon Oct 19 15:03:58 2015 +0200
+++ b/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Thu Oct 22 13:07:10 2015 -0400
@@ -1795,7 +1795,7 @@
   }
 
   // Used for PrintGC
-  size_t prev_used;
+  size_t prev_used = 0;
   if (PrintGC && Verbose) {
     prev_used = _cmsGen->used();
   }
@@ -7739,7 +7739,7 @@
 
   HeapWord* const fc_addr = (HeapWord*) fc;
 
-  bool coalesce;
+  bool coalesce = false;
   const size_t left  = pointer_delta(fc_addr, freeFinger());
   const size_t right = chunkSize;
   switch (FLSCoalescePolicy) {