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Subject:	Re: Analyzing a SEG FAULT that gdb doesn't help with
Reply-To:	cygwin AT cygwin DOT com
References:	<CAOC2fq_fahjLapKbgO8Xer8neEjv1Ohs4bM3JOWcka0ajjcbCg AT mail DOT gmail DOT com> <55BA373A DOT 4020909 AT dronecode DOT org DOT uk>
To:	cygwin AT cygwin DOT com
Cc:	mike AT kmcardiff DOT com
From:	Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID:	<55BB6F47.1000906@dronecode.org.uk>
Date:	Fri, 31 Jul 2015 13:51:19 +0100
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In-Reply-To:	<55BA373A.4020909@dronecode.org.uk>

On 30/07/2015 15:39, Jon TURNEY wrote:
> On 30/07/2015 00:16, Michael Enright wrote:
>> 1) Why is it not the case that gdb handles this SEGV in the usual
>> manner? It too just allows the stackdump to be made and lets me know
>> that the inferior has run its course.
>
> This shouldn't happen.  Are you sure the crashing process is the direct
> inferior of gdb, and not some wrapper process which runs it?
> (uninstalled libtool generated binaries do this, for e.g.)

Oh, I just remembered something :)

I think you need to use the gdb command 'set cygwin-exceptions on' to 
tell gdb to break on exceptions inside the cygwin DLL (by default they 
are ignored, as they may be generated during normal operation when 
checking a pointer is valid)

I shall have to see if I can find a place for these last couple of 
answers in the FAQ or documentation somewhere.  It's rather too obscure 
at the moment.


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