Comment 6 for bug 1714505

yep, having up to 3 seconds worth of stale system data is too much time. Also, I think the builtins can just validate themselves - for example the kmod builtin can trivially call kmod_validate_resource(ctx) every time it's asked to load a module, and I think the other builtins that implement .validate probably also can self-validate too, and remove the udev_builtin_validate() call entirely.

I have a small draft patch just to the kmod builtin that I'm testing:
https://code.launchpad.net/~ddstreet/+git/systemd/+ref/sf149300

I'll take another look next week to see if it can be expanded to cover all the builtins that do validation, and submit something upstream for discussion.