Smaller repro:

./python.exe -m configparser

Bisection shows that this is the call that causes the crash (line 1301):

        return _impl(self._name, option, raw=raw, vars=vars,
                     fallback=fallback, **kwargs)

But just that line doesn't trigger this -- apparently *everything* that came before it in that file is implicated. Or at least *something* that I haven't found yet.

Sorry for the play-by-play...