linux-kernel - Re: [uml-devel] [PATCH] UML

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Date:	Thu, 23 Aug 2007 16:50:37 +0200
From:	Blaisorblade <blaisorblade@...oo.it>
To:	user-mode-linux-devel@...ts.sourceforge.net
Cc:	Jeff Dike <jdike@...toit.com>, Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [uml-devel] [PATCH] UML - Add a .note.SuSE section

On mercoledì 22 agosto 2007, Jeff Dike wrote:
> On Tue, Aug 21, 2007 at 07:05:53PM +0200, Blaisorblade wrote:
> > It's not the first time we hit effects of such bugs, is it?
>
> I don't remember seeing this before.
>
> > The .note.ABI-tag fix, time ago, may be about the same problem.
>
> Are you referring to
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdi
>ff;h=c35e584c087381aaa5f1ed40a28b978535c18fb2;hp=a5bd1786fb30abe663b904f6d79
>bba413e9ba883?

Yes.

>If so, I never understood that - it just came in saying "this 
> fixes static building", so I sent it along.

In this case, I'm referring to the patch which had a typo, which is yours:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7632fc8f809a97f9d82ce125e8e3e579390ce2e5
Description follows:
"During a static link, ld has started putting a .note section in the
.uml.setup.init section.  This has the result that the UML setups begin
with 32 bytes of garbage and UML crashes immediately on boot.

This patch creates a specific .note section for ld to drop this stuff
into."

My patch only made your change work for real - IIRC you had fixed that exact 
typo too, but you forgot to run quilt refresh before sending the patch (btw, 
quilt pop -a will force you to refresh all patches to succeed - I do it 
frequently).

> BTW, that commit was singled 
> out by git-bisect as "causing" this particular problem.
>
> > Can you
> > double-check all UML linker scripts for more instances of this bug?
>
> I did, I have a patch, and it's been verified to fix the problem.

In this case, we _may_ want to remove the .note section altogether - even if 
it is likely to shake out more problems.

Good bye!
-- 
"Doh!" (cit.), I've made another another mistake!
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

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