GNU bug report logs - #42522
Emacs 27: 100% CPU when setting mode-name with ligatures

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Package: emacs;

Reported by: Evan Moses <emoses <at> gmail.com>

Date: Fri, 24 Jul 2020 22:30:01 UTC

Severity: normal

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Evan Moses <emoses <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs 27: 100% CPU when setting mode-name with ligatures
Date: Fri, 24 Jul 2020 14:35:50 -0700

[Message part 1 (text/plain, inline)]
Emacs version: GNU Emacs 27.0.91 (build 1, x86_64-apple-darwin18.7.0, NS
appkit-1671.60 Version 10.14.6 (Build 18G5033)) of 2020-07-24
Built d5acc509415869bce22c49ae311f2960494a0bdc locally


To reproduce, evaluate this

(set-char-table-range composition-function-table 47
'([".\\(?:\\(?:\\*\\*\\|//\\|==\\)\\|[*/=>]\\)" 0 font-shape-gstring]))

And then evaluate

(setq mode-name "test//")

Emacs will become unresponsive and consume 100% CPU.

-- 
Evan Moses
emoses <at> gmail.com

[Message part 2 (text/html, inline)]
This bug report was last modified 4 years and 279 days ago.

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