title: what does a python process return code -9 mean?
body: <p>I have a python script which returns the exit status of -9.</p>
  
  <p>I tried to get the root of the problem with the atexit module, but it does not get called.</p>
  
  <p>Any hints to help me find why and where my script terminates? </p>
  
  <p>The problem is reproducible, operating system: linux 3.7.10</p>