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From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Hartmut Holz" <hartmut.holz@arcor.de>,
        "Rik van Riel" <riel@conectiva.com.br>
Cc: "Linux kernel" <linux-kernel@vger.kernel.org>
In-Reply-To: <Pine.LNX.4.33L.0201261935330.32617-100000@imladris.surriel.com> <3C54546C.0@arcor.de>
Subject: Re: Uptime again?
Date: Sun, 27 Jan 2002 20:46:56 +0100
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From: "Hartmut Holz" <hartmut.holz@arcor.de>
> Rik van Riel wrote:
> >
> > The fact that lavrec crashes the machine while Xawtv works
> > suggests a device driver may be corrupting memory somewhere.
> >
>
> I got a debug patch from Manfred Spraul to debug slab.c.

poisoning of fields of 'struct page', slab poisoning, even of objects with constructors.
Same patch as:
http://groups.google.com/groups?selm=linux.kernel.3C3B6F65.F9226437%40colorfullife.com&rnum=1

> With this patch
> the machine ran for about 3 hours. No problem. I looked into slab.c and had an
> idea. What about just one CPU. So I built a new Kernel with just one CPU.
> Result: 1 CPU 1 Minute - 2 CPU 20 Minutes. I aspected a different result.
> In my opinion the whole thing has something to do with slab, SMP and threads.
>
Not with slab itself, probably with a slab user. Someone uses a stale pointer.

What do you means with one cpu? Did you boot a SMP kernel with "nosmp" on the command line, or did you make a kernel without
CONFIG_SMP?

--
    Manfred

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