> Why do you think this change caused that breakage? That bot looks like it's been broken for days. This change should have no behavior change whatsoever for Python itself.

It's right that the buildbot is broken for years:
https://mail.python.org/pipermail/python-dev/2016-September/146538.html

But the error changed, since the build 37, tests started to fail with a very specific error: "Fatal Python error: Aborted". The build 37 contains your change 1afc3f4f5502 and two other changes which only modify the Doc/ directory.

Sorry, I don't know more :-/ Maybe it's a false alarm, but it's worth to investigate.