I glanced through (info "(elisp) Undo") and didn't see any sort of
warning.  Should we add one?  I can certainly stick something in there
myself, but doubt it'd be quite correct.

On Sun, Dec 13, 2015 at 10:13 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Eric Hanchrow <eric.hanchrow@gmail.com>
> > Date: Sun, 13 Dec 2015 18:07:43 +0000
> > Cc: 22120@debbugs.gnu.org
> >
> > I'm surprised that it is possible to cause a segfault from lisp. Is that
> an
> > indication of a problem in the core C code, or is that just the way
> things are?
>
> That's what you get for messing with undo-list.
>