Workflows timing out since months

[ericzolf]

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Hi, since roughly 3 months, our pipelines have started to randomly time out after 360 minutes/6 hours (where they normally take less than 10min). Restarting the workflow generally fixes the issue, and other parallel workflows of the same type (matrix for different versions of Python) have worked perfectly fine, so I don't think that the issue is with our code.
Also the test pipeline doesn't seem to be in the middle of anything very specific when it gets stuck. Without knowing if it's just do to the sequence or if there is really a causality, but it seems to get stuck (at different positions) during "killing" tests, making sure that a backup stays in a consistent state even if getting killed (by signal 15). This said, I don't really know how this could relate.
Repo is https://github.com/rdiff-backup/rdiff-backup/ and the pipeline failing is generally in .github/workflows/test_linux.yml.

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