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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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: martin rudalics <rudalics <at> gmx.at>, Eli Zaretskii <eliz <at> gnu.org>, 65726-done <at> debbugs.gnu.org
Subject: bug#65726: 29.1.50; Crash in regexp engine
Date: Thu, 21 Sep 2023 14:08:58 -0400

> So this is what prevented me from running with counts above 2**15 and
> debugging enabled for all these years...

Looks like it.

In any case, I pushed a variant of the last patch to `master` and
I think the case is now closed.  We may want to revisit it, presumably
by really keeping track of the all visited nodes, but this seems to work
well for now and I'm confident that it is safe (regardless of the shape
of the bytecode, it should always terminate and it should never apply
the optimization if it's incorrect, and with the shape of the bytecode
we currently produce it does correctly apply the optimization in the cases
I checked).


        Stefan
This bug report was last modified 1 year and 242 days ago.

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