GNU bug report logs - #65726
29.1.50; Crash in regexp engine

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Package: emacs;

Reported by: martin rudalics <rudalics <at> gmx.at>

Date: Mon, 4 Sep 2023 07:48:02 UTC

Severity: normal

Found in version 29.1.50

Fixed in version 30.1

Done: Stefan Kangas <stefankangas <at> gmail.com>

Bug is archived. No further changes may be made.

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Message #43 received at 65726 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: martin rudalics <rudalics <at> gmx.at>, Eli Zaretskii <eliz <at> gnu.org>,
 65726 <at> debbugs.gnu.org
Subject: Re: bug#65726: 29.1.50; Crash in regexp engine
Date: Tue, 5 Sep 2023 14:23:19 +0200

Thank you for fixing it, but now regex-emacs-tests fail with a regexp stack overflow. It seems that by fixing this bug, we've unfixed the one that the broken code was supposed to fix.

And we should probably include a regression test for this bug as well. The previously mentioned

  (string-match (rx (* "a") (* (* "b"))) "a")

might suffice, but extending it to

  (string-match (rx (* "a") (* (or "c" (* "b")))) "a")

is safer in case the regexp compiler decides to simplify (* (* X)) -> (* X).
This bug report was last modified 1 year and 242 days ago.

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