Comment 16 for bug 2045586

That kernel change doesn't fix the issue:

https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dannf-loop/noble/amd64/l/livecd-rootfs/20240125_203808_8b5c9@/log.gz

Which actually didn't surprise me after thinking about it. systemd-udevd is going to ask for a partition reread when it gets the uevent for loop0 at some point - it doesn't matter if we hold it off until losetup's reread completes. There will always be a window where the partition device files disappear and reappear.

Perhaps we just need a `udevadm wait $rootfs_dev_mapper --settle`.