Timeout in collectcells leaves zombie processes

[youngmd]

We have been seeing a consistent issue with QR processes timing out, but the collectcells process is not being killed and the job hangs. I believe the issue is here:

podi_collectcells.py, Line 2158:

    if (p.is_alive()):
    logger.warning("Timeout event triggered, shutting things down ...")
    #kill_all_child_processes(process_tracker)

    logger.info("Killing collectcells after timeout...")
    # podi_logging.print_stacktrace()
    p.terminate()
    logger.info("all done after timeout problem/error!")
    return 1

There should be an additional p.join() after the p.terminate() to clear the child process entries entirely. Without that, the parent collectcells process appears as [python] <defunct> after exiting and cannot be killed directly.