linux-kernel - Re: 2.6.18-rc6-mm1: GPF loop on early boot

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Message-ID: <20060911051823.GA11269@elte.hu>
Date:	Mon, 11 Sep 2006 07:18:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Laurent Riffard <laurent.riffard@...e.fr>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: 2.6.18-rc6-mm1: GPF loop on early boot

btw., i dont think it's the early-bootup behavior of lockdep that causes 
your oops. I think %gs somehow ended up being invalid upon pagefault 
entry, well after bootup. Not sure why. Andi's patch just papers over 
this i believe.

ah ... found it meanwhile: in the syscall exit path the PDA patches 
restore the userspace %gs too early, trace_hardirqs_on() is called 
_after_ the restoring of %gs. Will send a patch in a few minutes.

	Ingo
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