Re: bug#54188: Crash when eval-ing font test elisp code

[Anand Tamariya <atamariya@gmail.com>]

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On Wed, Aug 28, 2024 at 6:07 PM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Anand Tamariya <atamariya@gmail.com>
> > Date: Wed, 28 Aug 2024 14:17:10 +0530
> >
> > Today I hit this bug. So I thought I'll provide some additional inputs.
> >
> > Some old fonts don't support non-ascii characters. In the sample, these
> characters are 180, 166 and 216.
> > When such a font is applied as :family attribute to the text, Emacs
> crashes.
>
> Can you give examples of such fonts, and show a GDB C-level backtrace
> from the crash?
>
I always get the crash when I scroll to the next page after the page in the
screenshot. I can't point out the specific font. So I have listed the
possible fonts on the next screen.


*Stacktrace:*
Thread 1 "temacs" received signal SIGSEGV, Segmentation fault.
0x00005555557fceb1 in fontset_find_font (fontset=fontset@entry=0x6c,
    c=c@entry=180, face=face@entry=0x555559804320,
    charset_id=charset_id@entry=-1, fallback=fallback@entry=false)
    at fontset.c:556
556  struct frame *f = (FRAMEP (FONTSET_FRAME (fontset))
(gdb) bt
#0  0x00005555557fceb1 in fontset_find_font
    (fontset=fontset@entry=0x6c, c=c@entry=180, face=face@entry=0x555559804320,
charset_id=charset_id@entry=-1, fallback=fallback@entry=false) at
fontset.c:556
#1  0x00005555557fd860 in fontset_font
    (fontset=fontset@entry=0x6c, c=c@entry=180, face=face@entry=0x555559804320,
id=-1) at fontset.c:767
#2  0x00005555557fdc1c in face_for_char
    (f=0x555556624d90, face=face@entry=0x555559804320, c=c@entry=180,
pos=<optimized out>, object=<optimized out>) at fontset.c:997
#3  0x000055555561386f in FACE_FOR_CHAR
    (object=<optimized out>, pos=<optimized out>, character=180,
face=0x555559804320, f=<optimized out>) at
/opt/Users/a_tam/work/emacs/src/dispextern.h:1896
#4  get_next_display_element (it=it@entry=0x7fffffff8590) at xdisp.c:7613
#5  0x000055555561c622 in display_line
    (it=it@entry=0x7fffffff8590, cursor_vpos=cursor_vpos@entry=0)
    at xdisp.c:23176
#6  0x0000555555627f6b in try_window
    (window=window@entry=0x555556625da5, pos=..., flags=0) at xdisp.c:19082
#7  0x0000555555642bdc in redisplay_window
    (window=<optimized out>, just_this_one_p=just_this_one_p@entry=false)
    at xdisp.c:18233
#8  0x0000555555645d7b in redisplay_window_0
    (window=window@entry=0x555556625da5) at xdisp.c:16214

*Font list*
Arundina Sans
Arundina Sans Mono
Arundina Serif
avant garde gothic
avantgarde
Bitstream Charter
bookman
BPG Algeti GPL&GNU
BPG Chveulebrivi GPL&GNU
BPG Courier GPL&GNU
BPG Courier S GPL&GNU
BPG DedaEna Block GPL&GNU
BPG DejaVu Sans 2011 GNU-GPL
BPG Elite GPL&GNU
BPG Excelsior Caps GPL&GNU
BPG Excelsior Condencerd GPL&GNU
BPG Excelsior GPL&GNU
BPG Glaho GPL&GNU
BPG Gorda GPL&GNU
BPG Ingiri GPL&GNU
BPG Mrgvlovani Caps GNU&GPL
BPG Mrgvlovani GPL&GNU
BPG Nateli Caps GPL&GNU
BPG Nateli Condenced GPL&GNU
BPG Nateli GPL&GNU
BPG Nino Medium Cond GPL&GNU
BPG Nino Medium GPL&GNU
BPG Sans GPL&GNU
BPG Sans Medium GPL&GNU
BPG Sans Modern GPL&GNU
BPG Sans Regular GPL&GNU
BPG Serif GPL&GNU
BPG Serif Modern GPL&GNU
C059

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