code: private void checkAnyChunk(long p) {
      if (VALIDATING) {
        if (!isAligned(chunkToMem(p)))
          throw new AssertionError("Chunk address [mem:" + p + "=>chunk:" + chunkToMem(p) + "] is incorrectly aligned");
        if (!okAddress(p))
          throw new AssertionError("Memory address " + p + " is invalid");
      }
    }
docs: /* Check properties of any chunk, whether free, inuse, mmapped etc