Re: [Xen-devel] error in xen/arch/x86/mm.c:get_page during migration

[Olaf Hering <olaf@xxxxxxxxx>]

On Fri, Feb 22, Jan Beulich wrote:

> >>> On 21.02.13 at 18:31, Olaf Hering <olaf@xxxxxxxxx> wrote:
> > It did not happen with xl.
> 
> But the same guest and Dom0 kernel, and the same hypervisor?

Yes, same sles11sp2 dom0, and 3.7.9 pvops guest.

> > Here is the output while doing xm migrate:
> > 
> > (XEN) HVM2 restore: VMCE_VCPU 0
> > (XEN) HVM2 restore: VMCE_VCPU 1
> > (XEN) HVM2 restore: TSC_ADJUST 0
> > (XEN) HVM2 restore: TSC_ADJUST 1
> > (XEN) mm.c:1983:d0 Error pfn 4112c5: rd=ffff83036ffef000, 
> > od=0000000000000000, caf=180000000000000, taf=7400000000000001
> 
> Didn't even notice yesterday that this is apparently after restore
> has already started. Which makes me curious whether the domain
> that is being referenced with rd= is the old or the new one (would
> require printing the domain ID; honestly I never understood what
> use printing of the domain pointer is).
> 
> I'm also confused by the domain pointer always being the same;
> I would expect it to at least toggle between two values, but
> probably even be different between every instance of the guest.
> But you're not having a stubdom configured for the guest either,
> according to the config you sent earlier...

The rd->domain_id is DOMID_COW in both cases.


Olaf

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