Hi, I've been moving my workflow orchestration into Prefect, and recently ran across some strange hanging behavior in moving from one task to another which I'm hoping someone can shed some light on. This behavior was observed running Prefect 1.4.0 from windows cmd. I saw it on two different flows so far, and it's a bit inconsistent. What I'm seeing is that one or more of the tasks will have completed (according eg to the logs generated by the actual task), but then it hangs right at the end. When I press Ctrl-C (the first time was to try to abort the run since that's the usual behavior), instead of aborting it seems to prod it into acknowledging that the task completed successfully and it then moves on the next task. I haven't been able to rerun much to test since these are large flows that takes more than a day to run, but in each case I've seen it happening in a few of the tasks but not others, and in one case I was able to rerun for test purposes, and it happened again, but on a different step from the first time. I'm going to post some more details in a thread.

Hey @Brian Osserman Would you be able to put together a minimum reproducible example of the issue you're seeing This isn't an issue I've seen come up before so it's hard to say exactly what could be causing it, On a side note if you're just getting started moving over to prefect I'd suggest checking out Prefect 2 as it is our LTS product https://docs.prefect.io/

Hi, unfortunately, this is hard to reproduce when I tinker with it. I tried rerunning with a smaller input file, and it only happened one out of six times. And when we tried isolating the first task and rerunning it, it didn't hang at all.