podman stop: Unable to clean up network: unmounting network namespace: device or resource busy #19721
Description
Seeing this quite often in my PR with #18442 cherrypicked:
? Enter [AfterEach] TOP-LEVEL
$ podman [options] stop --all -t 0
time="2023-08-22T18:28:28-05:00" level=error msg="Unable to clean up network for container XYZ:
"unmounting network namespace for container XYZ:
failed to remove ns path /run/user/3418/netns/netns-9965a9b5-facb-7fe9-44e3-f99ec7d69365:
remove /run/user/3418/netns/netns-9965a9b5-facb-7fe9-44e3-f99ec7d69365: device or resource busy\""
Example: int f38 rootless.
It almost always happens together with the "Storage ... removed" flake (#19702), e.g.:
So I mostly file under that issue, because my flake tool has no provision for multiple buckets.
No pattern yet (that I can see) in when it fails, which tests, etc.