From: Lars Ingebrigtsen <larsi@gnus.org>
To: Paul Pogonyshev <pogonyshev@gmail.com>
Cc: 57804@debbugs.gnu.org
Subject: bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely
Date: Wed, 14 Sep 2022 18:41:53 +0200 [thread overview]
Message-ID: <87pmfx6h7y.fsf@gnus.org> (raw)
In-Reply-To: <CAG7BparYHpwcdpVMOKoQ_OOVQA7EULhvEyR=BsZit6-xkpRPSg@mail.gmail.com> (Paul Pogonyshev's message of "Wed, 14 Sep 2022 17:05:54 +0200")
Paul Pogonyshev <pogonyshev@gmail.com> writes:
> C-g doesn't help anymore. The only thing you can do is to kill and start Emacs anew.
[...]
> (define-derived-mode buggy-mode nil "buggy"
> (setf font-lock-defaults '(nil nil t nil (font-lock-fontify-region-function . buggy-fontifier)))
> (font-lock-mode 1))
>
> (defun buggy-fontifier (start end loudly)
> (add-face-text-property start (min (+ start 15) end) 'bold)
> (while t
> "whoopsie")
> nil)
Yes, it's really unfortunate that you can't get out of errors like this
without killing Emacs.
We've previously discussed making a certain key sequence disable font
locking in a buffer -- or blacklist the particular functions that's
inflooping somehow.
For instance, if the user hits `C-g' three times (and Emacs doesn't idle
in between), then we disable font-lock in that buffer.
There's also `max-redisplay-ticks' -- but I'm not sure that would have
helped here?
next prev parent reply other threads:[~2022-09-14 16:41 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 [this message]
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
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