GNU bug report logs - #15405
24.3; #[] freezes emacs

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Package: emacs;

Reported by: Leo Liu <sdl.web <at> gmail.com>

Date: Wed, 18 Sep 2013 01:52:02 UTC

Severity: normal

Merged with 16512

Found in version 24.3

Fixed in version 24.4

Done: Barry OReilly <gundaetiapo <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: Barry OReilly <gundaetiapo <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Dmitry Antipov <dmantipov <at> yandex.ru>, 15405 <at> debbugs.gnu.org, Leo Liu <sdl.web <at> gmail.com>, stephen.berman <at> gmx.net
Subject: bug#15405: 24.3; #[] freezes emacs
Date: Wed, 25 Sep 2013 13:10:29 -0400

> Without any special casing of zero vectors, the allocator calls
> SETUP_ON_FREE_LIST for a zero vector and sets v->u.next.  But for a
> zero vector the allocator only allows enough memory for the header, so
> setting the next pointer corrupts other memory.

Yes, that's why we have special cased the zero-length vectors.

How many different zero vectors do we need?  We at least need 2 (the []
and the #[]), but do we need others?  If not, let's try and change the
code so that we can have those two pre-allocated and use the right one
at the right place.


        Stefan
This bug report was last modified 11 years and 176 days ago.

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