Re: [Xen-devel] kernel BUG at arch/x86/xen/mmu.c:1860!

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jan 04, 2011 at 04:10:17PM +0100, Christophe Saout wrote:
> Hello thread,
> 
> hijacking this thread since I am running into the same issue on a new
> machine.
> 
> > >      > While doing LVM snapshot for migration and get the following:
> > >      >
> > >      > Dec 26 15:58:29 xen01 kernel: ------------[ cut here ]------------
> > >      > Dec 26 15:58:29 xen01 kernel: kernel BUG at 
> > > arch/x86/xen/mmu.c:1860!
> > >      > Dec 26 15:58:29 xen01 kernel: invalid opcode: 0000 [#1] SMP
> > >      > Dec 26 15:58:29 xen01 kernel: last sysfs file: /sys/block/dm-26/dev
> > >      > Dec 26 15:58:29 xen01 kernel: CPU 0
> > >      > Dec 26 15:58:29 xen01 kernel: Modules linked in: ipt_MASQUERADE
> >
> > It would be very good to track this down and get it fixed.. 
> > hopefully you're able to help a bit and try some things to debug it.
> > 
> > Konrad maybe has some ideas to try.. 
> 
> I am seeing this with an lvcreate here, so I guess it's somehow related
> to device-mapper stuff in general.
> 

Sorry if this was already stated earlier..
what are the exact steps to reproduce? I could try reproducing it at some 
point..

-- Pasi

> It doesn't look like this has been resolved yet.  Somewhere I saw a
> request for the hypervisor message related to the pinning failure.
> 
> Here it is:
> 
> (XEN) mm.c:2364:d0 Bad type (saw 7400000000000001 != exp 1000000000000000) 
> for mfn 41114f (pfn d514f)
> (XEN) mm.c:2733:d0 Error while pinning mfn 41114f
> 
> I have a bit of experience in debugging things, so if I can help someone
> with more information...
> 
> Cheers,
>       Christophe
> 
> 

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