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Re: [Xen-devel] Kernel 3 Crashes on 4.2 unstable

On Mon, Aug 01, 2011 at 08:59:41PM +0200, Andi Reinbrech wrote:
> On 2011/08/01 03:45 AM, Pasi Kärkkäinen wrote:
> >On Sun, Jul 31, 2011 at 09:07:02PM +0200, Andi Reinbrech wrote:
> >>Hi,
> >>
> >>I am unable to pinpoint this problem; on an old core2duo Xen 4.2 and
> >>kernel 3.0 as dom0 works, but on a newer i5 (same distro, same packages,
> >>all "baselined") the crashes as soon as Xen finishes booting.

Does the kernel crash if you boot it as baremetal?

> >>
> >>The crash happens before anything useful is written to the serial
> >>console, and causes the machine a complete warm boot with no exceptions
> >>or error messages.
> >>
> >>I have tried nomodeset, but I'm not sure the kernel gets as far as
> >>initialising graphics, it may still be in the stage of unpacking the
> >>initrd.

> >>
> >>I would greatly appreciate any pointers to try an help to debug this, or
> >>hear from other testers with similar experience.
> >>
> >>The config of kernel 3.0 I'm using is the "vanilla" fedora rawhide
> >>version, 3.0 however, not the latest git rc.
> >>
> >See http://wiki.xen.org/xenwiki/XenParavirtOps
> >the chapter called "Are there more debugging options I could enable to 
> >troubleshoot problems with Xen and/or dom0 kernel?"
> >
> >Make sure you enable all those..
> >
> >-- Pasi
> >
> Thank you Pasi,
> Will dig a bit deeper.  I saw that page also has very detailed
> instructions for a custom kernel, I will try and tune a little and
> compile a few versions.  I have a feeling it may very well be
> graphics related.  Will feed back here when I have details.
> I have extensive C and hardware/embedded knowledge and would love to
> get a bit more involved in Xen.  Hopefully I can contribute, however
> small, here and there :-)

Awesome. Not sure if the 'earlyprintk=xenboot' is mentioned in the Wiki but
that one is quite useful.

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