@Override
  public String toString() {
    return super.toString() + ":<dataSize=" + getDataSize() + " refCount=" + getRefCount()
        + " addr=" + Long.toHexString(getAddress()) + ">";
  }
Validates that the fill pattern for this chunk has not been disturbed. This method assumes the
TINY_MULTIPLE is 8 bytes.

@throws IllegalStateException when the pattern has been violated.
geode-core/src/main/java/org/apache/geode/internal/offheap/OffHeapStoredObject.java