GNU bug report logs - #57804
An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 57804 <at> debbugs.gnu.org, pogonyshev <at> gmail.com
Subject: bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely
Date: Wed, 14 Sep 2022 20:44:24 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: Paul Pogonyshev <pogonyshev <at> gmail.com>,  57804 <at> debbugs.gnu.org
> Date: Wed, 14 Sep 2022 19:38:12 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > This case is exactly one of those which I think we shouldn't try to
> > fix, because it's the case of "buggy Lisp program", a.k.a. "don't do
> > that".  There's no reason for any useful Lisp program to have an
> > infloop like this:
> >
> >>   (while t
> >>     "whoopsie")
> 
> You've never accidentally put an infloop into a font locking function?

While testing my code? sure.  But after testing, no, the loops are
generally gone.

> We should definitely fix this is we can.

I disagree.

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