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

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From: Po Lu <luangruo <at> yahoo.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 57804 <at> debbugs.gnu.org, Paul Pogonyshev <pogonyshev <at> gmail.com>
Subject: bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely
Date: Thu, 15 Sep 2022 13:20:51 +0800

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> 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?
> Then you've been very lucky.
>
> We should definitely fix this is we can.

Why isn't jit-lock-debug-mode an option?

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