GNU bug report logs - #44111
27.1; segmentation fault starting emacsclient with -n option

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From: Nicolas Carranza <nicarran <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 44111 <at> debbugs.gnu.org, nicarran <at> yandex.com
Subject: bug#44111: 27.1; segmentation fault starting emacsclient with -n option
Date: Wed, 21 Oct 2020 16:25:27 -0500

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I tested branch emacs-27 including your patch
<http://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-27&id=e29cace60afdab04ff20c4f4043a3ee64ec9d01d>
and the bug is gone, excellent, :-)
I will continue using this version and report new problems if there are
any.
Thank you!

On Wed, Oct 21, 2020 at 10:35 AM Eli Zaretskii <eliz <at> gnu.org> wrote:

> > From: Nicolas Carranza <nicarran <at> gmail.com>
> > Date: Wed, 21 Oct 2020 00:07:49 -0500
> > Cc: nicarran <at> yandex.com
> >
> > I can reproduce an emacs segmentation fault following this steps on my
> > system:
> >
> > 1. Start emacs as daemon using:
> > emacs --daemon=myEmacs
> >
> > 2. Start emacsclient using:
> > emacsclient -s myEmacs -n -c test.org
> >
> > 3. emacs crashes:
>
> Thanks.
>
> Can you try the patch below?  I've just installed it on the emacs-27
> branch.
>
> diff --git a/src/xdisp.c b/src/xdisp.c
> index 6c401d0..03dc4be 100644
> --- a/src/xdisp.c
> +++ b/src/xdisp.c
> @@ -22793,6 +22793,10 @@ maybe_produce_line_number (struct it *it)
>    int lnum_face_id = merge_faces (it->w, Qline_number, 0,
> DEFAULT_FACE_ID);
>    int current_lnum_face_id
>      = merge_faces (it->w, Qline_number_current_line, 0, DEFAULT_FACE_ID);
> +  /* From here onwards, we must prevent freeing realized faces, because
> +     we are using the above 2 face IDs for the glyphs we produce.  */
> +  bool save_free_realized_faces = inhibit_free_realized_faces;
> +  inhibit_free_realized_faces = true;
>    /* Compute point's line number if needed.  */
>    if ((EQ (Vdisplay_line_numbers, Qrelative)
>         || EQ (Vdisplay_line_numbers, Qvisual)
> @@ -22922,10 +22926,13 @@ maybe_produce_line_number (struct it *it)
>           it->lnum_width = 0;
>           it->lnum_pixel_width = 0;
>           bidi_unshelve_cache (itdata, false);
> +         inhibit_free_realized_faces = save_free_realized_faces;
>           return;
>         }
>      }
>
> +  inhibit_free_realized_faces = save_free_realized_faces;
> +
>    /* Record the width in pixels we need for the line number display.  */
>    it->lnum_pixel_width = tem_it.current_x;
>    /* Copy the produced glyphs into IT's glyph_row.  */
>

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