While playing with Rendler <https://github.com/mesosphere/RENDLER> I noticed that if the task (read: python executor) crashes, the underlying executor stays alive and therefore is not reaped, which renders the task running indefinitely. Here <https://gist.github.com/rukletsov/4a74743c5b67f304e661> is a part of the slave log (exception itself doesn't matter, it's there to test the behaviour). Not sure, whether it's a bug or a feature, for me it looks like a bug.
Regards, Alex
