title: Python memory leak which is not recognized by profiler
body: <p>The program can work fine for days, but at some random point it starts growing ~60MB/hour.</p>
  
  <ol>
  <li>Profilers like guppy and pympler doesn't show leaked memory. (they show ~30mb used, while ps resident memory use is 1,5GB)</li>
  <li>Gdb-heap C profiler shows a lot of chunks of memory as 'uncategorized'.</li>
  <li>Gc.collect didn't show garbage collection problems.</li>
  <li>We don't use any non-default C libraries, so I don't think it's C level leak.</li>
  </ol>
  
  <p>Is that a dead end? Can something else be done to find the issue?</p>