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    SubjectRe: 2.6.26-git: NULL pointer deref in __switch_to
    On Mon, Jun 16, 2008 at 03:15:39AM -0700, Simon Holm Thøgersen 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 <kaber@trash.net> 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 am on this and did try reproducing with lguest last week but couldn't
    reproduce the issue with the initrd image. May be I need a full blown
    disk image.

    > 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).

    Please post the oops you captured.

    > If you or anybody else would like to use the same guest image I use
    > please just ask and I'll make it available somehow.

    Can you please upload it some where? I will also try with another guest
    image meanwhile.

    thanks,
    suresh
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