From: Eli Zaretskii <eliz@gnu.org>
To: Po Lu <luangruo@yahoo.com>
Cc: larsi@gnus.org, 57804@debbugs.gnu.org, pogonyshev@gmail.com
Subject: bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely
Date: Thu, 15 Sep 2022 09:27:14 +0300 [thread overview]
Message-ID: <831qsd17b1.fsf@gnu.org> (raw)
In-Reply-To: <87wna5xlfw.fsf@yahoo.com> (message from Po Lu on Thu, 15 Sep 2022 13:20:51 +0800)
> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, 57804@debbugs.gnu.org, Paul Pogonyshev
> <pogonyshev@gmail.com>
> Date: Thu, 15 Sep 2022 13:20:51 +0800
>
> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
> > Eli Zaretskii <eliz@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?
It definitely is, for the particular use case of debugging font-lock.
So is running font-lock-fontify-buffer by hand.
So is attaching a debugger when such an infloop is bumped into
accidentally without expecting it.
There's also the recently-added backtrace-on-redisplay-error feature,
which could help with diagnosing such problems, perhaps combined with
debug-on-entry or somesuch.
IOW, I think we have already several useful tools available for the
particular problem of debugging loops in font-lock, if we want to
interpret this bug report in that narrow interpretation.
prev parent reply other threads:[~2022-09-15 6:27 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 15:05 bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely Paul Pogonyshev
2022-09-14 16:00 ` dick
2022-09-14 16:06 ` Paul Pogonyshev
2022-09-14 16:14 ` dick
2022-09-14 17:52 ` Lars Ingebrigtsen
2022-09-14 18:18 ` Eli Zaretskii
2022-09-14 16:41 ` Lars Ingebrigtsen
2022-09-14 16:57 ` Paul Pogonyshev
2022-09-14 17:25 ` Lars Ingebrigtsen
2022-09-14 17:30 ` Paul Pogonyshev
2022-09-14 17:43 ` Eli Zaretskii
2022-09-14 17:45 ` Lars Ingebrigtsen
2022-09-14 17:49 ` Eli Zaretskii
2022-09-15 2:17 ` Ihor Radchenko
2022-09-14 17:34 ` Gregory Heytings
2022-09-15 14:47 ` Paul Pogonyshev
2022-09-15 15:10 ` Gregory Heytings
2022-09-15 15:37 ` Paul Pogonyshev
2022-09-15 16:08 ` Gregory Heytings
2022-09-15 16:19 ` Paul Pogonyshev
2022-09-15 16:44 ` Gregory Heytings
2022-09-15 18:49 ` Paul Pogonyshev
2022-09-15 19:16 ` Eli Zaretskii
2022-09-15 19:36 ` Paul Pogonyshev
2022-09-15 19:45 ` Eli Zaretskii
2022-09-15 20:18 ` Gregory Heytings
2022-09-15 20:22 ` Lars Ingebrigtsen
2022-09-15 20:40 ` Paul Pogonyshev
2022-09-15 20:44 ` Gregory Heytings
2022-09-15 21:17 ` Paul Pogonyshev
2022-09-15 21:32 ` Gregory Heytings
2022-09-15 21:49 ` Paul Pogonyshev
2022-09-15 22:16 ` Gregory Heytings
2022-09-15 22:53 ` Paul Pogonyshev
2022-09-15 23:13 ` Gregory Heytings
2022-09-16 6:40 ` Eli Zaretskii
2022-09-16 10:08 ` Paul Pogonyshev
2022-09-16 10:44 ` Eli Zaretskii
2022-09-16 6:31 ` Eli Zaretskii
[not found] ` <1260fd38-d4b3-5ca1-5b15-78f59c0255b6@yandex.ru>
[not found] ` <83o7t9k8fr.fsf@gnu.org>
[not found] ` <CAG7Bpaow570a8Qrq6VxU+=MNF55UmnCMFFXT2Eg=vQUTgrxeoQ@mail.gmail.com>
[not found] ` <34e17bf2a6bdd269fba7@heytings.org>
[not found] ` <CAG7BpapFE0HEwi8iUoStz9EyAwH-QdZ_CxOUNtdUeKDmzCrZaQ@mail.gmail.com>
[not found] ` <338f50d421074805735f@heytings.org>
[not found] ` <831qpnngeg.fsf@gnu.org>
[not found] ` <338f50d421b672315145@heytings.org>
2022-11-28 18:32 ` Eli Zaretskii
2022-09-16 1:17 ` Ihor Radchenko
2022-09-16 5:35 ` Eli Zaretskii
2022-09-15 19:44 ` Gregory Heytings
2022-09-15 20:07 ` Paul Pogonyshev
2022-09-15 20:26 ` Gregory Heytings
2022-09-16 5:37 ` Eli Zaretskii
2022-09-15 22:20 ` dick
2022-09-15 22:38 ` Gregory Heytings
2022-09-16 6:19 ` Eli Zaretskii
2022-09-16 7:44 ` Gerd Möllmann
2022-09-14 17:02 ` Eli Zaretskii
2022-09-14 17:25 ` Paul Pogonyshev
2022-09-14 17:32 ` Eli Zaretskii
2022-09-14 17:38 ` Lars Ingebrigtsen
2022-09-14 17:44 ` Eli Zaretskii
2022-09-14 17:46 ` Lars Ingebrigtsen
2022-09-14 17:51 ` Eli Zaretskii
2022-09-15 5:20 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-09-15 6:27 ` Eli Zaretskii [this message]
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