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bug#57804: An infinite loop in a `fontify-region' function causes Emacs
From: |
Lars Ingebrigtsen |
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 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
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?
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Paul Pogonyshev, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely,
Lars Ingebrigtsen <=
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Paul Pogonyshev, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Lars Ingebrigtsen, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Paul Pogonyshev, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Eli Zaretskii, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Lars Ingebrigtsen, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Eli Zaretskii, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Ihor Radchenko, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Gregory Heytings, 2022/09/14
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Paul Pogonyshev, 2022/09/15
- bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely, Gregory Heytings, 2022/09/15