title: time going back on Android
body: <p>I am developing an app, and from time to time I am getting this weird message:</p>
  
  <pre><code>W/SystemClock(11814): time going backwards: prev 9003590393023(ioctl) vs now 9003584533648(ioctl), tid=11856
  </code></pre>
  
  <p>what does it mean? why does it happen?</p>
  
  <p>thanks!</p>