title: session_start(): open(/var/lib/php5/sess_ibfocfkgbpfaoimac34nkjotp2, O_RDWR) failed
body: <p>I am trying to register as a new user on a Symfony 2 project, i've been working on. This popped up all of a sudden. It was working in office yesterday, and I've setup a similar setup at home. I got:</p>
  
  <blockquote>
    <p>Warning: session_start(): open(/var/lib/php5/sess_ibfocfkgbpfaoimac34nkjotp2, O_RDWR) failed: Read-only file system (30) in /home/projects/notes/app/cache/dev/classes.php line 406</p>
  </blockquote>
  
  <p>Whats wrong? </p>