GNU bug report logs - #73022
31.0.50; Crash in build_frame_matrix_from_leaf_window after C-x 2 and reducing terminal size

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Message #11 received at 73022 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Daniel Clemente <n142857 <at> gmail.com>, 73022 <at> debbugs.gnu.org
Subject: Re: bug#73022: 31.0.50; Crash in build_frame_matrix_from_leaf_window
 after C-x 2 and reducing terminal size
Date: Wed, 4 Sep 2024 09:28:47 +0200

Sorry, my last mail went at the wrong address.  Reposting.

> In particular, I found a case in which an assert fails because the
> window row glyph memory is not contained in the frame row glyph
> memory.
>
> It happens in a recent build (99a03ddb2d4) built without X support.
> I'm running it in a urxvt terminal but it happens in xterm too. It
> crashes both with and without glyph debug. This is not related to
> garbage collection like bug 71289.
>
> To reproduce:
> 1. Open emacs -Q
> 2. Press C-x 2 to split the frame (top/bottom)
> 3. Make the terminal very small (I slowly resize the X window that's
> running urxvt, to the minimum size, 1 row and 2 columns in my case).
> This shrinking process alone can produce the crash when the window is
> around 5 lines high
> 4. It always crashes in my case. If it doesn't, make the terminal
> larger again, and repeat the resizing for some seconds until it
> crashes
>
> Note that the C-x 2 is required. The problem doesn't happen with a
> left/right split (C-x 3). But it happens after a C-x 3 C-x 2.

Kindly have a look at the fix I proposed here:

https://lists.gnu.org/archive/html/emacs-devel/2024-09/msg00054.html

If necessary, I can send you a patch.

Thanks, martin

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