title: " php console cache:clear " not working. The command freezes in symfony2 terminal
body: <p>I am trying to clean the cache of my application</p>
  
  <p>But once I run the </p>
  
  <pre><code>php console cache:clear --env=prod -vvv
  </code></pre>
  
  <p>It stays running... 
  The application in the webserver alos stop responding.</p>
  
  <p>I tried to add -vvv but it doesn't show any comments.</p>
  
  <p>At the end I always have to stop the process by tapping Ctrl C</p>
  
  <p>What could be? How could I debug that?</p>
  
  <p>One additional question: how long normally it should take to clean the cache?</p>