title: App dies with "Sending signal." but no exception or other info
body: <p>I'm working on an app that is recording data via Bluetooth, but it intermittently crashes after hours of collecting data (making it hard to track down the bug).</p>
  
  <p>The logcat output isn't very helpful:</p>
  
  <p><a href="http://i.imgur.com/EalnX.png" rel="noreferrer">http://i.imgur.com/EalnX.png</a></p>
  
  <p>There are no exceptions thrown and no clues for what caused the process to be terminated.</p>
  
  <p>How can I figure out what went wrong?  Is there an exception being thrown that isn't being shown by logcat?  How can I track this bug down?</p>