Message-ID: <20040430182138.8758.qmail@lwn.net>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: linux-kernel@vger.kernel.org, ak@suse.de
Subject: Re: [BUG] 2.6.6-rc2-bk5 mm/slab.c change broke x86-64 SMP 
From: corbet@lwn.net (Jonathan Corbet)
In-reply-to: Your message of "Fri, 30 Apr 2004 18:11:46 +0200."
             <200404301611.i3UGBkdK026345@harpo.it.uu.se> 
Date: Fri, 30 Apr 2004 12:21:38 -0600
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 898
Lines: 20

> The change to mm/slab.c between 2.6.6-rc2-bk4 and -bk5
> broke x86-64 SMP. The symptoms are general protection
> faults in __switch_to shortly after init starts, and
> then the machine is dead. (Can't be more specific, my
> box can't log early boot oopses.)
> 
> I'm only seeing this with x86-64 SMP; x86-64 UP and i386
> SMP on the same machine (Athlon64 UP) have no problems.

FWIW, this sure looks a lot like the boot-time crash I'm seeing; I get the
same __switch_to oopses once init starts.  *But* I'm running a UP,
no-preempt kernel.  And I get it with -rc1 as well.  Might reverting the
later slab change be concealing a different problem?

jon
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