I use actions/cache@v3 in a pre-commit check workflow on self-hosted runners (summerwind/actions-runner image).

Intermittently (e.g. yesterday and today) the Post Setup steps are extremely slow. Each step takes 2 min 12 sec (plusminus 1 sec).

Looking at the logs and a pcap network trace I observe that the packages (several MiB) are transferred in a few seconds max, but then the connection to GitHub hangs until it probably hits a timeout. Remote IP address for each TCP stream is 20.246.192.124 (Microsoft).

Maybe related to #720?

Excerpt from workflow log:

(The five lines in each step are presented quickly, and then the workflow hangs for the two minutes.)