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bug#33885: 27.0.50; PUA character makes emacs crash
From: |
Eli Zaretskii |
Subject: |
bug#33885: 27.0.50; PUA character makes emacs crash |
Date: |
Thu, 27 Dec 2018 13:33:36 +0200 |
User-agent: |
K-9 Mail for Android |
On December 27, 2018 12:36:14 PM GMT+02:00, Eli Zaretskii <eliz@gnu.org> wrote:
> On December 27, 2018 10:54:59 AM GMT+02:00, Werner LEMBERG
> <wl@gnu.org> wrote:
> >
> > Loading the attached file `bug.el' (containing the single PUA
> > character U+E6A3) with
> >
> > emacs -Q bug.el
> >
> > causes a crash:
> >
> > xdisp.c:28955:
> > Emacs fatal error:
> > assertion failed:
> > it->ascent >= 0 && it->descent >= 0
> >
> > I've also attached the output of `bt full'.
>
>
> Thanks.
>
> Do you have some custom font setup, which is supposed to display this
> PUA character? Because on my system, there's no font for this
> codepoint (as I'd expect), and therefore Emacs displays it as
> "glyphless" character, showing a box with the character's code in hex,
> and that avoids the assertion violation.
>
> So please step through x_produce_glyphs when Emacs needs to produce a
> glyph for this character, and tell how you end up with both ascent and
> descent values zero. It isn't supposed to happen with valid fonts.
Sorry, I meant these values should be non-negatve. It seems like in your case,
descent is -5? How come?
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/27
- bug#33885: 27.0.50; PUA character makes emacs crash, Eli Zaretskii, 2018/12/27
- bug#33885: 27.0.50; PUA character makes emacs crash,
Eli Zaretskii <=
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Eli Zaretskii, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Eli Zaretskii, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Eli Zaretskii, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Werner LEMBERG, 2018/12/28
- bug#33885: 27.0.50; PUA character makes emacs crash, Eli Zaretskii, 2018/12/28