title: UITableView apparently crashing with _BSMachError
body: <p>I am receiving the following errors in iOS 10 between calls to <code>tableView(_:numberOfRowsInSection)</code> and <code>tableView(_:cellForRowAt)</code> for a <code>UITableView</code> that is backed by a <code>NSFetchedResultsController</code>:</p>
  
  <pre><code>&lt;Time&gt; &lt;MyApp&gt;[&lt;Id&gt;] [Common] _BSMachError: port 1407; 
    (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
  &lt;Time&gt; &lt;MyApp&gt;[&lt;Id&gt;] [Common] _BSMachError: port 1407; 
    (os/kern) invalid name (0xf) "Unable to deallocate send right"
  </code></pre>
  
  <p>At his point, the app uses only UIKit, Core Data and <code>URLSession</code>, i.e. nothing <a href="https://stackoverflow.com/a/39677402/1789384">fancy</a>.</p>
  
  <p>What could be the reason why, and how can I overcome this problem?</p>