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Date:	Wed, 02 Jun 2004 10:29:43 -0400
To:	"Demmer, Thomas" <TDemmer AT krafteurope DOT com>,
	Cygwin List <cygwin AT cygwin DOT com>
From:	Larry Hall <cygwin-lh AT cygwin DOT com>
Subject:	Re: Weird problem with gdb 2003-09-20-cvs (cygwin-special)
In-Reply-To:	<0706F4CDC397BF4483877BFDA8DBD3A54622A5@kjsdemucshrexc1.eu. pm.com>
References:	<0706F4CDC397BF4483877BFDA8DBD3A54622A5 AT kjsdemucshrexc1 DOT eu DOT pm DOT com>
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At 04:06 AM 6/2/2004, you wrote:
>Hi list,
>I have encountered a strange situation that I can boil down to
>the attached test case. To reproduce the problem
>issue 
>$ echo 123 > a.dat
>$ gcc -Wall -pedantic -o insi insi.c
>
>The program runs fine when run from the command-line. Running 
>within insight or gdb the sscanf dies with 
>(gdb) run
>Starting program: /m/c/insi.exe 
>
>Program received signal SIGSEGV, Segmentation fault.
>0x77e75a3f in KERNEL32!IsBadWritePtr () from
>/c/WINDOWS/system32/kernel32.dll
>
>This does not happen when compiled with -mno-cygwin.
>
>To me this looks like a heap corruption, but where? It used to
>work fine with 1.5.9 and fails now under 1.5.10.
>read_whole_line() is from the snippets collection, which makes me believe
>that the bug is not in this part, but who knows. 
>
>Any pointers on where and what to search?
>


I'd recommend starting with the stack traceback.  If nothing is obvious 
from that and you want to chase your suspicion that something in cygwin1.dll
is causing the problem, you'll need to build the DLL yourself so you can 
debug into it.


--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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