title: UIWebView makes app deadlock when playing videos
body: <p>Our app has a UIWebView that playing videos one by one with html5  tag. We use source and change src.</p>
  
  <p>Time to time app gets the deadlock. It gets it just on iPad air devices(probably coincidence) and iOS 8.</p>
  
  <p>Main thread stack:
  <img src="https://i.stack.imgur.com/VCYOi.jpg" alt="Main Thread"></p>
  
  <p>AVAudioSession thread stack:
  <img src="https://i.stack.imgur.com/Xoymd.jpg" alt="AVAudioSession Thread"></p>
  
  <p>I thought that the webview must not lock the main thread despite its content.</p>
  
  <p>I would be thankful for any help on this.</p>