linux-kernel - Re: vmscan.c:196: bad pmd (kernel 2.4.25)

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Date:	Thu, 7 Dec 2006 06:39:01 +0100
From:	Willy Tarreau <w@....eu>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: vmscan.c:196: bad pmd (kernel 2.4.25)

Hi,

On Wed, Dec 06, 2006 at 09:22:29AM +0100, Jesper Juhl wrote:
> The following messages just showed up in dmesg on one of my servers.
> The server seems to be running fine but I would like to know if
> there's a real problem here or if the message is just noise.
>
> The server is running 2.4.25
> 
> vmscan.c:196: bad pmd 000001e3.
> vmscan.c:196: bad pmd 004001e3.
...
> vmscan.c:196: bad pmd 378001e3.
> vmscan.c:196: bad pmd 37c001e3.

I may be wrong, but to me it looks either like memory corruption
affecting one pgd, and by extension all of its pmds, or an old
bug in 2.4.25, but I don't recall seeing such a thing.

Anyway, I would personally reboot the server after such a thing, as I
really don't like it when VM is going mad.

Regards,
Willy

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