The fix for 6819891 inadvertently introduced a memory leak, in
the C-heap, of the order of 2KB*ParallelGCThreads per scavenge.
Over a period of time such a leak can run the JVM out of C-heap
memory and lead to availability issues in the field.
This bug should be fixed in hs14 where it was first introduced.
The bug affects the 64-bit compressed oops jvm using the ParNew
(or CMS) collector.
The following fix (based on an hs15 jvm) is under test and will
be available for review:-