Torsten Landschoff added the comment: That sounds like you did not initialize the freeze support of the multiprocessing module:
https://docs.python.org/3/library/multiprocessing.html#multiprocessing.freeze_support Basically, you need to add the following code to your main, before anything else: from multiprocessing import freeze_support freeze_support() Interestingly, the documentation states that starting a new Process instance without freeze_support will raise a RuntimeError. Maybe the detection of that situation failed in your case? ---------- nosy: +torsten _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21505> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
