I set up a  project where I added the "Strategy for choosing what to build" behavior and set "Commit in ancestry" to a given commit.

Now when Jenkins polls the repo, it mostly finds branches without that commit, and ends up spitting out "ERROR: Couldn't find any revision to build. Verify the repository and branch configuration for this job." over and over.

I set this up because the commit in question is in a branch that adds bits needed for Jenkins to do its thing, so other older branches simply cannot be run in Jenkins. Once my branch is merged to master and all the older branches are gone, that won't be needed, but for now this is quite annoying.