linux-kernel - Re: Extending coredump note section to contain filenames

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Message-ID: <4F5E76CE.4030601@zytor.com>
Date:	Mon, 12 Mar 2012 15:21:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Kratochvil <jan.kratochvil@...hat.com>
CC:	Denys Vlasenko <dvlasenk@...hat.com>,
	Roland McGrath <roland@...k.frob.com>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	Kushal Das <kdas@...hat.com>
Subject: Re: Extending coredump note section to contain filenames

On 03/12/2012 09:53 AM, Jan Kratochvil wrote:
> 
>> Why we don't save library names in coredump?
> 
> Because they are useless.  If you have a filename there how to find which
> content it should match?  Even if you verify the file is still there with the
> same content there is a race it can no longer be true when you read the core
> file 5 seconds later.
> 
> The build-id mapping server above always works and without races.
> 

It seems to me that there would be value in having *both*.

In particular, for libraries which aren't installed in standard system
directories (because they are test versions or mapped with dlopen()) it
would be good to have a hint of where to find them.  The build-id can
then tell you if you have the right version.

	-hpa

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