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Re: [Xen-devel] xen/stable-2.6.32.x xen-4.1.1 live migration fails with kernels 2.6.39, 3.0.3 and 3.1-rc2

On Mon, Aug 22, 2011 at 03:56:43PM +0200, Andreas Olsowski wrote:
> >Does it also fail the other way round (host2 ->  host1)? If not, your
> >issue is likely fixed with 23102:1c7b601b1b35 on 4.1-testing (and
> >with you posting on xen-devel rather than xen-users I would really
> >have expected that you would have looked for similar reports or
> >eventual fixes before complaining).
> It did happen host2->host1 and host1->host2 with xen4.1.1-
> I did set up 2 servers with identical hardware now and in fact i
> dont have any problems with them migrating machines.
> I went on to upgrade all 3 servers (2x 32gb 1x96gb) to xen-4.1-testing.

Did you check that your xen-4.1-testing had the patch above?
> Now i can migrate 32gbhost->32gbhost and 32gbhost->96gbhost but
> 96gbhost->32gbhost still fails.
> BUG: unable to handle kernel paging request at fffffffffffffff8
> with 2.6.39 and 3.1 guest kernels, 3.0 didnt produce any output on
> its tty0 anymore.
> This issue may be a little more then a memory size mismatch, since i
> have 3 servers running xen4.2 with 96gb ram two Dell R610s and one
> R710, where the R610s can migrate guests between each other just
> fine.
> They can also migrate to the R710 and back.
> But a host created on the R710 cant be migrated to a R610.
> The same exact thing happens with 4.1-testing.
> A guest created on a 32gb host can be migrated to the 96gb host and
> back to any 32gb host.
> But a guest created on the 96gb host can not be migrated to a 32gb host.

Which sounds like the patch above should have fixed. Again, did you
check your binary and source tree to see if you have the mentioned

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