GNU bug report logs - #61704
29.0.60; Crash in get_narrowed_begv

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Message #65 received at 61704 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: martin rudalics <rudalics <at> gmx.at>, Eli Zaretskii <eliz <at> gnu.org>,
 61704 <at> debbugs.gnu.org
Subject: Re: bug#61704: 29.0.60; Crash in get_narrowed_begv
Date: Thu, 23 Feb 2023 21:11:43 +0800

Gregory Heytings <gregory <at> heytings.org> writes:

> I maintain that the bug is (was) most probably not in get_narrowed_*.
> I just built Emacs with the GTK, Lucid and no toolkits, I disabled
> everything (tool-bar, menu-bar, scroll-bar, fringe-mode 0), and even
> with that, after resizing the Emacs frame until it is literally a
> single pixel on screen, I'm not able to get (under emacs -Q) a window
> width or a height equal to 0 there.  The smallest values I get are
> width = 2 and height = 1.

What if you send a ConfigureNotify event with x, y, width, height all
set to 0, and with a frame font set larger than the font in the ediff
control window?  Or some ridiculous value like (CARD16) -1?

> That, the fact that this code has been there for a half year without a
> single reported crash (if resizing a window is enough to trigger such
> a crash, that would surely have happened already), and the fact that
> get_narrowed_* is not executed at all in the ediff control frame,
> means that there is a bug somewhere else.

Feel free to try to find that other bug, but I can't, since this bug now
seems to be fixed.

Thanks.

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