title: Multiprocessing freezing because of semaphore_tracker process in the background
body: <p>I am using Python Multiprocessing for a project and sometimes the process freezes and apparently the reason why it is happening is this process I find running <code>ps aux</code>:</p>
  
  <pre><code>python -c from multiprocessing.semaphore_tracker import main;main(39)
  </code></pre>
  
  <p>Some more info:</p>
  
  <ul>
  <li>If I kill the process everything runs fine</li>
  <li>This problem is not frequent, meaning there could be days running everything fine without it happenning</li>
  <li>I am using PyCharm</li>
  <li>I am runing this Python code in a server using PyCharm remote interpreter and sometime using SSH</li>
  </ul>
  
  <p><strong>Questions:</strong></p>
  
  <ul>
  <li>What is happening that this process is appearing?</li>
  <li>Why isn't it finishing by itself?</li>
  <li>What does it do that freezes other processes?</li>
  <li>How to avoid this situation?</li>
  </ul>