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: Eli Zaretskii <eliz <at> gnu.org>
To: rudalics <at> gmx.at
Cc: n142857 <at> gmail.com, 73022 <at> debbugs.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: Wed, 04 Sep 2024 16:23:37 +0300

> Cc: n142857 <at> gmail.com, 73022 <at> debbugs.gnu.org
> Date: Wed, 04 Sep 2024 15:21:16 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > Date: Wed, 4 Sep 2024 09:28:47 +0200
> > From:  martin rudalics via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> > 
> >  > 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
> 
> Thanks, but could you tell how that change could have affected this
> assertion violation?  AFAICT, adjust_frame_glyphs is not in the
> backtrace, so how could moving code inside of it affect what happens
> here?

In any case, I can cause the assertion violation even after making the
change you suggested above.

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