Limiting the Dom0 number of cpus to 1 in
/etc/xend-confix.xsp (dom0-cpus 1)
cures the problem.
Additional I've pinned Domain-0 vcpu0 to cpu0
(xm vcpu-pin 0 0 0)
but this is not neccessary.
# xm vcpu-list
Name ID VCPUs CPU State Time(s) CPU Affinity
Domain-00 0
Package: linux-image-2.6.18-4-xen-amd64
Version: 2.6.18.dfsg.1-10snapshot.8256
Followup-For: Bug #410807
Bug 410807 is critical - renders XEN nearly unusable !
When starting up four xen paravirtualized domains
quickly (no pause beetween the xm create) I sometimes
get the attached kernel panic -
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