linux-kernel - Re: i386 doublefault handler is broken with CONFIG_DEBUG

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Message-ID: <20070809231618.GC1845@one.firstfloor.org>
Date:	Fri, 10 Aug 2007 01:16:18 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: i386 doublefault handler is broken with CONFIG_DEBUG_SPINLOCK

On Thu, Aug 09, 2007 at 02:40:27PM -0400, Chuck Ebbert wrote:
> On 08/09/2007 01:49 PM, Andi Kleen wrote:
> > Chuck Ebbert <cebbert@...hat.com> writes:
> >> Initializing FS in the doublefault_tss should fix it.
> >>
> >> Signed-off-by: Chuck Ebbert <cebbert@...hat.com>
> >>
> >> ---
> >>
> >>  NOTE: not even compile tested.
> > 
> > Can you please test it?
> > 
> 
> It compiles but I can't really test it further right now.

I tested it. Even on a box without spin lock debugging I get a hard
hang after

double fault, gdt at c1404000 [255 bytes]

even though it should have printed the registers.
So it looks like there is more broken in the DF handler than just
this.

-Andi
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