From: Eli Zaretskii <eliz@gnu.org>
To: "C. Florian Ebeling" <florian.ebeling@gmail.com>
Cc: 11541@debbugs.gnu.org, cyd@gnu.org
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 [thread overview]
Message-ID: <83fwag1biu.fsf@gnu.org> (raw)
In-Reply-To: <16181D4F-4289-47B2-AF61-FCBD189AF4B0@gmail.com>
> 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
next prev parent reply other threads:[~2012-05-31 17:54 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 10:29 bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3 Florian Ebeling
2012-05-24 22:08 ` bug#11541: Florian Ebeling
2012-05-26 8:33 ` bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3 Jan Djärv
2012-05-26 20:12 ` Florian Ebeling
2012-05-29 14:06 ` Chong Yidong
2012-05-29 19:48 ` Florian Ebeling
2012-05-30 3:22 ` Chong Yidong
2012-05-30 7:55 ` Florian Ebeling
2012-05-30 10:31 ` Chong Yidong
2012-05-30 10:53 ` C. Florian Ebeling
2012-05-30 13:36 ` Chong Yidong
2012-05-30 14:39 ` Florian Ebeling
2012-05-31 6:52 ` Chong Yidong
2012-05-31 7:12 ` Florian Ebeling
2012-05-31 9:31 ` Chong Yidong
2012-05-31 10:19 ` Florian Ebeling
2012-05-31 15:48 ` Eli Zaretskii
2012-05-31 17:27 ` C. Florian Ebeling
2012-05-31 17:54 ` Eli Zaretskii [this message]
2012-05-31 19:15 ` Alp Aker
2012-05-31 19:48 ` Eli Zaretskii
2012-05-31 19:50 ` C. Florian Ebeling
2012-05-31 20:11 ` Eli Zaretskii
2012-05-31 21:55 ` Florian Ebeling
2012-06-01 3:50 ` YAMAMOTO Mitsuharu
2012-06-01 5:43 ` Florian Ebeling
2012-06-01 6:14 ` Eli Zaretskii
2012-06-01 6:36 ` Florian Ebeling
2012-06-01 6:41 ` Chong Yidong
2012-06-01 6:44 ` Florian Ebeling
2012-06-01 8:53 ` Eli Zaretskii
2012-06-01 11:57 ` Jan D.
2012-06-01 13:42 ` Chong Yidong
2012-06-01 6:17 ` Eli Zaretskii
2012-06-01 6:46 ` Florian Ebeling
2012-06-01 8:47 ` Eli Zaretskii
2012-06-01 8:55 ` Florian Ebeling
2012-06-01 9:21 ` Eli Zaretskii
2012-06-01 14:51 ` Florian Ebeling
2012-06-01 16:12 ` Jan Djärv
[not found] ` <mailman.2085.1338562350.855.bug-gnu-emacs@gnu.org>
2012-06-18 23:06 ` jamezilla
2012-06-20 19:56 ` Florian Ebeling
[not found] ` <mailman.3138.1340222261.855.bug-gnu-emacs@gnu.org>
2012-06-22 5:29 ` jamezilla
2012-06-01 8:52 ` Florian Ebeling
2012-06-01 8:56 ` Eli Zaretskii
2012-09-26 20:30 ` bug#11541: - Another reproduction - Emacs 24.2; Null pointer on OSX with cocoa UI mrevilgnome
2012-09-26 20:41 ` mrevilgnome
2012-10-14 18:58 ` bug#11541: 24.0.97; Crash when visiting file on OS X 10.7.3 Jan Djärv
2012-10-15 21:15 ` C. Florian Ebeling
2012-10-16 5:05 ` Jan Djärv
2012-11-01 9:49 ` Thomas Kappler
2012-11-06 11:01 ` bug#11541: Possible fix Thomas Kappler
2012-11-08 19:53 ` Jan Djärv
2012-11-09 10:27 ` bug#11541: THanks! Thomas Kappler
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