title: Is it possible to accidentally overwrite "meta-data" in VkDeviceMemory?
body: <p>From the answer from this <a href="https://www.reddit.com/r/vulkan/comments/6uixdr/comment/dlt59yz/?utm_source=share&amp;utm_medium=web2x&amp;context=3" rel="nofollow noreferrer">reddit post</a>.</p>
  <blockquote>
  <p>...drivers may need some additional meta-data to manage given resource. That's why we need to call vkGet...MemoryRequirements() functions and allocate enough memory.</p>
  </blockquote>
  <p>However, <code>vkMapMemory</code> maps the allocated memory, inside which the meta-data required by driver may be contained, according to the above answer.</p>
  <p>When I write to that mapped memory, how am I supposed to know whether I am overwriting
  the meta-data?</p>