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bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3
From: |
Florian Ebeling |
Subject: |
bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3 |
Date: |
Thu, 31 May 2012 23:55:40 +0200 |
> The code involved in this hardly ever touches Emacs internals. It's
> simple ObjC code, at least to my naive eyes.
I stepped through the whole thing, but I didn't notice anything, not
that that would mean too much.
> As the first goal, I suggest to try figuring out what happens with the
> font_spec argument to ns_findfonts -- is it corrupted right at entry
> to the function, or does it get corrupted later? You should display
> it, using the same commands you used for scratch_font_spec in its
> caller, right at the entry to the function. Assuming the value at
> entry is OK (which would be my guess), then step through the code of
> ns_findfonts, and see which line causes its corruption.
The corruption of font_spec doesn't occur now, but the crash still occurs.
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
0x00007fff8966d3c2 in CFStringGetLength ()
(gdb) f 18
#18 0x00000001001a1253 in ns_findfonts (font_spec=4338015181,
isMatch=0 '\000') at nsfont.m:532
532 matchingDescs = [fdesc matchingFontDescriptorsWithMandatoryKeys:
fkeys];
...
(gdb) pp font_spec
#<font-spec ns apple nil nil iso10646-1 nil nil nil nil nil nil nil
((:script . symbol))>
(gdb) p font_spec
$45 = 4338015181
(gdb) xtype
Lisp_Vectorlike
PVEC_FONT
So right after the crash the font_spec still looks like a legit lisp
object. Don't ask me why that was different before. The values here
and in other mails were copy-pasted, so that did happen.
--
Florian Ebeling
florian.ebeling@gmail.com
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, (continued)
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Florian Ebeling, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Chong Yidong, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Florian Ebeling, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Eli Zaretskii, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, C. Florian Ebeling, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Eli Zaretskii, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Alp Aker, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Eli Zaretskii, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, C. Florian Ebeling, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Eli Zaretskii, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3,
Florian Ebeling <=
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, YAMAMOTO Mitsuharu, 2012/05/31