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bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs
From: |
Eli Zaretskii |
Subject: |
bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs |
Date: |
Sat, 19 Nov 2016 12:27:27 +0200 |
> Date: Sat, 19 Nov 2016 10:07:03 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: Josh Berdine <josh@berdine.net>, 22818@debbugs.gnu.org
>
> On Sat, Nov 19, 2016 at 09:07:50AM +0200, Eli Zaretskii wrote:
> > Can you convert the address in frame #0 into line numbers? Judging by
> > the faulting address, 0xd0, some pointer in
> > ns_compute_glyph_string_overhangs is a null pointer, but it's hard to
> > tell which one without the line number information.
>
> I finally managed to replicate this on my own build:
>
> (lldb) run -Q ~/test-file
> Process 66588 launched:
> '/Users/alan/src/emacs/emacs-25/nextstep/Emacs.app/Contents/MacOS/Emacs'
> (x86_64)
> Process 66588 stopped
> * thread #1: tid = 0x154600, 0x00000001002c0940
> Emacs`ns_compute_glyph_string_overhangs(s=0x00007fff5fbfb6f0) + 224 at
> nsterm.m:2681, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
> (code=1, address=0xd0)
> frame #0: 0x00000001002c0940
> Emacs`ns_compute_glyph_string_overhangs(s=0x00007fff5fbfb6f0) + 224 at
> nsterm.m:2681
> 2678 else
> 2679 {
> 2680 s->left_overhang = 0;
> -> 2681 if (EQ (font->driver->type, Qns))
> 2682 s->right_overhang = ((struct nsfont_info *)font)->ital ?
> 2683 FONT_HEIGHT (font) * 0.2 : 0;
> 2684 else
> (lldb) bt all
> * thread #1: tid = 0x154600, 0x00000001002c0940
> Emacs`ns_compute_glyph_string_overhangs(s=0x00007fff5fbfb6f0) + 224 at
> nsterm.m:2681, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
> (code=1, address=0xd0)
> * frame #0: 0x00000001002c0940
> Emacs`ns_compute_glyph_string_overhangs(s=0x00007fff5fbfb6f0) + 224 at
> nsterm.m:2681
> frame #1: 0x0000000100058e7c Emacs`draw_glyphs(w=0x000000010204f430,
> x=570, row=0x000000010240e100, area=TEXT_AREA, start=0, end=52,
> hl=DRAW_NORMAL_TEXT, overlaps=0) + 3324 at xdisp.c:25673
So the question now becomes: how did that glyph_string got a NULL
font? The answer is somewhere in the code that generates glyph
strings as part of the call to BUILD_GLYPH_STRINGS. Can you try
figuring out why does that happen, by stepping through the code in
BUILD_GLYPH_STRINGS?
> (lldb) frame variable
> (glyph_string *) s = 0x00007fff5fbfb6f0
> (font *) font = 0x0000000000000000
>
> (lldb) frame variable *s
> (glyph_string) *s = {
> x = 10
> y = 16
> ybase = 30
> width = 11
> background_width = 11
> height = 20
> left_overhang = 0
> right_overhang = 0
> f = 0x0000000102050430
> w = 0x000000010204f430
> display = 0x0000000000000000
> window = 1
> row = 0x000000010240e100
> area = TEXT_AREA
> char2b = 0x0000000000000000
> nchars = 1
> hl = DRAW_NORMAL_TEXT
> face = 0x000000010153b400
What kind of face is s->face?
Thanks.
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Josh Berdine, 2016/11/18
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Eli Zaretskii, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs,
Eli Zaretskii <=
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Eli Zaretskii, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Eli Zaretskii, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Eli Zaretskii, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Eli Zaretskii, 2016/11/19
- bug#22818: 25.1.1 Emacs.app crash ns_compute_glyph_string_overhangs, Alan Third, 2016/11/19