Hi,

Although this problem is specific to xen, the cause is most likely due 
to recent changes within current.

xenbus_probe is showing up as a zombie under all my current domus:

2 ?       ZW   0:00.00 (xenbus_probe)

dom0 and domu (kernel and userland) built from CVS - Wed Mar 28 10:14:18 
EST 2007.

If there is something else I can provide, let me know.

So far this problem has not caused me any grief that I am aware of, I 
figured it was worthwhile mentioning because it could, in the end, help 
resolve an unrelated problem ...

Sarton