From: Ingo Molnar <mingo@elte.hu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Christian Kujau <lists@nerdbynature.de>,
LKML <linux-kernel@vger.kernel.org>,
Markus Rehbach <markus.rehbach@gmx.de>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: 2.6.25-rc6: BUG: unable to handle kernel NULL pointer dereference
Date: Thu, 27 Mar 2008 16:26:09 +0100 [thread overview]
Message-ID: <20080327152609.GA5406@elte.hu> (raw)
In-Reply-To: <alpine.LFD.1.00.0803271615470.3781@apollo.tec.linutronix.de>
* Thomas Gleixner <tglx@linutronix.de> wrote:
> On Tue, 25 Mar 2008, Andrew Morton wrote:
> > > Code: 53 c0 e8 20 08 fc ff c1 e3 02 8b 14 33 89 54 24 20 8b 44 24 20 85 c0 75 10 eb 51 8b 12 89 54 24 20 8b 44 24 20 85 c0 74 43 8b 02 <0f> 18 00 90 8d 5a d8 39 6b 34 75 e4 8b 7c 24 0c 39 7b 30 75 db
>
> It faults in a prefetch.
>
> > Markus reported what looks to be the same thing here:
> > http://lkml.org/lkml/2008/3/21/202 and it's already in the regresison list.
>
> Same here. And both are AMD X2 early stepping machines.
>
> > I guess you've confirmed that this wasn't a mystery
> > once-off-on-that-machine.
> >
> > I can't think what we did to cause this.
>
> I had a lengthy bug decoding session with Ingo and we found the root
> cause:
>
> A dropped workaround for the prefetch bug in early X2s and
> Opterons. Patch below.
can also be tested by picking up x86.git/latest, which has this patch
included:
http://people.redhat.com/mingo/x86.git/README
Ingo
next prev parent reply other threads:[~2008-03-27 15:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-25 23:08 2.6.25-rc6: BUG: unable to handle kernel NULL pointer dereference Christian Kujau
2008-03-26 6:33 ` Andrew Morton
2008-03-26 21:56 ` Rafael J. Wysocki
2008-03-26 23:57 ` Christian Kujau
2008-03-27 15:20 ` Thomas Gleixner
2008-03-27 15:26 ` Ingo Molnar [this message]
2008-03-27 18:30 ` Markus Rehbach
2008-03-27 19:26 ` Thomas Gleixner
2008-03-27 23:50 ` Björn Steinbrink
2008-03-28 8:50 ` Christian Kujau
2008-03-28 1:46 ` Christian Kujau
2008-03-28 10:25 ` Ingo Molnar
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