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i tried one day my github actions running for 1½ hours, doing a very simple update to the infra. Then i discovered it and shut it down. But the stack was then i an updating state.
This is really not good if it happens on production stacks

I can confirm that I observe the same behavior from time to time (maybe once a month). However, I cannot reproduce it. For me it looks like a deadlock, and I usually just kill the local process (CTRL-C) and start it again.

i do the same, or restart my CI build. But a few times it happened that the freeze would occur in the middle of performing the update,  meaning that the stack will get stuck in an "updating" state.
This is pretty serious since cleaning up is then not very easy

I've experienced that maybe twice now. I think (but can't confirm) that the culprit was the AWS session expiring during the run.