The issue seems to be related to fs-backend when issuing the "save" domain
command. After fs-backend has launched 20 stubdoms it is no longer able to
save a domU. 
Same behavior in xen 3.3.0, 3.3.1 and 3.3.2-rc1-pre on the official 2.6.18.8
kernel.
Keith Coleman
keith coleman-2 wrote:
>
> fs-backend is unable to save/restore or live migrate more than 19
> times. The first 19 work perfectly but on the 20th restore the domU
> and domU-dm freeze. I'm using Xen 3.3.1 with the official 2.6.18.8
> kernel. I've also tried Lenny's dom0 kernel and had the same issue.
> I've tried various linux and windows flavors inside the domU.
>
> As long as fs-backend is restarted every 19th time that the domU is
> saved there are no problems.
>
> Has anyone else noticed this?
>
> Keith
>
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