@lindahua I went on a little rant in #5472 about this issue, namely that most of the tests implement incorrect error bounds and are adjusted heuristically, resulting in the current brittleness. I've started putting in the proper error bounds on things, but it's a slow and manual process.

#4638 even discusses the possibility of moving the Woodbury code out of Base, but that's primarily a matter of convenience rather than addressing the root problem.

@andreasnoackjensen