From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: Oops
Date: Wed, 10 Jan 2007 11:38:06 -0800
Message-ID: <45A5409E.50507@goop.org>
References: <45A399D7.3090205@suse.de> <45A41B60.3070500@goop.org>
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To: Gerd Hoffmann <kraxel@suse.de>
Cc: Virtualization Mailing List <virtualization@lists.osdl.org>
List-Id: virtualization@lists.linuxfoundation.org

Gerd Hoffmann wrote:
> config is attached.
>
> It faults in fork syscall, down in pgd_walk().  It finds a pmd entry
> pointing to a machine page where the mfn_to_pfn translation returns -1
> aka 0xffffffff.  Trying to find a struct page for that one doesn't work .=
..
>   =


Hm, that's interesting but curious.  Hm, the mapping is in userspace? =

How did userspace get a foreign/special mapping?

Is this the very first fork()?  Nothing should be mapped down there at
all, so maybe there's a bug in initial pagetable setup.

    J