private void free() {
          OffHeapStoredObject chunk = chunks.remove(random.nextInt(chunks.size()));
          totalAllocation -= chunk.getSize();

          /*
           * Chunk is filled here but another thread may have already grabbed it so we cannot
           * validate the fill.
           */
          chunk.release();
        }
Frees a random chunk from the Chunk list.
geode-core/src/integrationTest/java/org/apache/geode/internal/offheap/MemoryAllocatorFillPatternIntegrationTest.java