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    SubjectRe: 2.6.26-git: NULL pointer deref in __switch_to
    Simon Holm Th������������������������ wrote:
    > fre, 13 06 2008 kl. 15:47 -0700, skrev Suresh Siddha:
    >> On Fri, Jun 13, 2008 at 11:24:01AM -0700, Vegard Nossum wrote:
    >>> On Fri, Jun 13, 2008 at 7:42 PM, Patrick McHardy <> wrote:
    >>>> I get this oops once a day, its apparently triggered by something
    >>>> run by cron, but the process is a different one each time.
    >>>> Kernel is -git from yesterday shortly before the -rc6 release
    >>>> (last commit is the usb-2.6 merge, the x86 patches are missing),
    >>>> .config is attached.
    >>>> I'll retry with current -git, but the patches that have gone in
    >>>> since I last updated don't look related.
    >>> Thanks for the report.
    >>>> [62060.043009] BUG: unable to handle kernel NULL pointer dereference at
    >>>> 000001ff
    >>>> [62060.043009] IP: [<c0102a9b>] __switch_to+0x2f/0x118
    >>>> [62060.043009] *pde = 00000000
    >>>> [62060.043009] Oops: 0002 [#1] PREEMPT
    >> Patrick, Do you see any other error messages before this BUG stmt? Can you
    >> please provide the complete kernel log till the point of failure?
    > Suresh, I'm pretty sure this is the same problem that I reported two
    > weeks ago [1]. I suggested that you tried running lguest and reproduced
    > the problem locally, but I did not hear back from you. Now Patrick is
    > reporting the same problem and is also indicating that the problem is
    > correlated with his use of lguest, so I'd really like you to follow up
    > on this.
    >> I have a theory for your problem and have appended a patch to test it. Can
    >> you please check if the appended patch fixes your problem.
    > At least for me, with this patch applied on top of -rc4 or -rc6+ the
    > problem still triggered after running an lguest guest for less than 30
    > seconds (the guest didn't even finish the boot of an image of Ubuntu
    > with no X-server).

    The patch also didn't fix the problem here, I got the same crash this
    morning. Unfortunately netconsole didn't log it, but its essentially
    the same as the one I posted.

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