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bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3
From: |
Eli Zaretskii |
Subject: |
bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3 |
Date: |
Thu, 31 May 2012 20:54:49 +0300 |
> From: "C. Florian Ebeling" <florian.ebeling@gmail.com>
> Date: Thu, 31 May 2012 19:27:13 +0200
> Cc: Chong Yidong <cyd@gnu.org>,
> 11541@debbugs.gnu.org
>
> > This might be a slower way to find the culprit, but I think it is a
> > lot more sure to give good results.
>
> This is what a healthy and the crashing call produce with font_spec and fdesc
> being printed:
>
> Breakpoint 2, ns_findfonts (font_spec=4338015181, isMatch=0 '\000') at
> nsfont.m:496
> 496 Lisp_Object tem, list = Qnil;
> #<font-spec ns nil Monaco nil iso10646-1 nil nil nil nil nil nil nil
> ((:script . symbol))>
>
> Breakpoint 3, ns_findfonts (font_spec=4338015181, isMatch=0 '\000') at
> nsfont.m:529
> 529 if (!FONT_SPEC_P (font_spec))
> #<font-spec ns nil Monaco nil iso10646-1 nil nil nil nil nil nil nil
> ((:script . symbol))>
>
> Breakpoint 2, ns_findfonts (font_spec=4338015181, isMatch=0 '\000') at
> nsfont.m:496
> 496 Lisp_Object tem, list = Qnil;
> #<font-spec ns apple nil nil iso10646-1 nil nil nil nil nil nil nil ((:script
> . symbol))>
>
> Breakpoint 3, ns_findfonts (font_spec=4338015181, isMatch=0 '\000') at
> nsfont.m:529
> 529 if (!FONT_SPEC_P (font_spec))
> #<font-spec ns apple nil nil iso10646-1 nil nil nil nil nil nil nil ((:script
> . symbol))>
>
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
> 0x00007fff8966d3c2 in CFStringGetLength ()
>
> (gdb) i b
> Num Type Disp Enb Address What
> --- snip ---
> 2 breakpoint keep y 0x00000001001a0fb5 in ns_findfonts at nsfont.m:496
> breakpoint already hit 7 times
> pp font_spec
> continue
> 3 breakpoint keep y 0x00000001001a11ca in ns_findfonts at nsfont.m:529
> breakpoint already hit 7 times
> pp font_spec
> continue
>
> I can't really tell which font_spec is acceptable, and which not, though.
>
> The crashing one has a third element of nil, is that ok or not?
I have no idea. Assuming I understand the data you presented, one
font (Monaco) is OK, but another (apple) is not? That still makes no
sense to me.
That's why I suggested to actually _step_ through the code of
ns_findfonts, one line at a time, including stepping into any
functions it calls whose source is part of Emacs, looking for possible
culprits, like NULL pointers, garbled pointers, uninitialized
variables, blown-up stack, etc. Just showing a few breakpoint hits
won't cut it, as it didn't until now, if my experience in debugging
tricky problems means anything.
Like I said: it might be slower, but in the end it will surely
deliver.
TIA
- 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, Chong Yidong, 2012/05/30
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, C. Florian Ebeling, 2012/05/30
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Chong Yidong, 2012/05/30
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, Florian Ebeling, 2012/05/30
- 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, 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 <=
- 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, 2012/05/31
- bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3, YAMAMOTO Mitsuharu, 2012/05/31