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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.02.13 at 21:07, Olaf Hering <olaf@xxxxxxxxx> wrote:
> 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.

Which suggests that memory sharing is in use. At least I'm unaware
of other uses of that pseudo domain.

Jan


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