Our git plugin is set up to poll for commits whenever a commit is pushed, and when we left on Friday evening it seems that Jenkins build the same commit ~1300 times. It seemed to start at 18:34 on Friday and then finish at 05:00 this morning (Monday).

Our builds take ~1 minute to run at the moment, and a quick look through the console log seems to suggest that the pre-build made Jenkins decide it needed to do another build