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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From: martin rudalics <rudalics <at> gmx.at>
To: Daniel Clemente <n142857 <at> gmail.com>
Cc: 73022 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#73022: 31.0.50; Crash in build_frame_matrix_from_leaf_window after C-x 2 and reducing terminal size
Date: Sun, 8 Sep 2024 16:43:54 +0200

> In cmcheckmagic we have:
>        if (!MagicWrap (tty) || curY (tty) >= FrameRows (tty) - 1)
>            emacs_abort ();
>
> Is this an assertion that needs to always hold?

I very strongly doubt so myself.  And strangely it's _always_ an
off-by-one error here just as you sketched below.

> I have tried
> copy-pasting it at the beginning of tty_write_glyphs and I found that
> it fails continuously (e.g. it tests: 62 >= 63-1). Actually I used a
> breakpoint instead of emacs_abort.
> Are there useful places where I could trace that  the assertion holds
> true?, earlier places than the current place.

I suppose in all those cases curX (tty) == FrameCols (tty) does not hold
so the assertion does not trigger.

martin

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