linux-kernel - Re: [BUG] i386 relocable kernel breakes /proc/kcore debugging

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Message-ID: <m11weqvuls.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 30 Jul 2007 08:23:11 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jan Kratochvil <jan.kratochvil@...hat.com>
Cc:	Vivek Goyal <vgoyal@...ibm.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] i386 relocable kernel breakes /proc/kcore debugging

Jan Kratochvil <jan.kratochvil@...hat.com> writes:

> On Mon, 30 Jul 2007 10:03:03 +0200, Vivek Goyal wrote:
>> On Sat, Jul 28, 2007 at 04:43:43AM +0300, Maxim Levitsky wrote:
> ...
>> > gdb 'thinks' that all kernel symbols are below 0x80000000 , while they are
> at
>> > 0xC000....
>> > 
>> > Turning CONFIG_RELOCATABLE off fixes that, so I assume that is the reason
> for
>> > that.
>> 
>> This is a gdb issue. I had raised it in gdb mailing list some time back.
>> 
>> http://sourceware.org/ml/gdb/2006-08/msg00137.html
>
> There was the patch post:
> 	http://sources.redhat.com/ml/gdb/2006-08/msg00182.html
>
>> What version of gdb you are using? I know it got fixed for gdb shipped
>> with RHEL5. I am not sure about what upstream version of gdb it got fixed
>> in.
>
> It did not make it to the upstream as the patch above is an imperfect one.
> It is fixed in RH gdb-6.5-5 upwards, therefore Fedora 6 + RHEL-5.
> 	http://cvs.fedora.redhat.com/viewcvs/*checkout*/devel/gdb/gdb-6.5-bz203661-emit-relocs.patch?root=core

Has anyone looked at the filtering by ignoring SHTSYM_TAB?  The other
approach suggested?  The patch above only works for ET_EXEC because
we can safely ignore everything.

Eric
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