Stub domains broken in 3.4.0-rc3?

[Keith Coleman <list.keith@scaltro.com>]

Is there a known issue that prevents stub domains from working in 3.4.0-rc3?

I attempted to use a stub domain configuration files that worked in
xen 3.3.1 but they don't work due to the recent addition of
automatically generated -dm files. Moving some config lines from the
old -dm file to the -stub file allows the creation process to go a
little further but I get the following error:

# cat /var/log/xen/qemu-dm-win4.log
Error: Device 768 (vbd) could not be connected.
Device /dev/mapper/testvg-win4s is mounted in a guest domain,
and so cannot be mounted now.
Using config file "/etc/xen/stubdoms/win4-dm".
Using config file "/etc/xen/stubdoms/win4-dm".

The stub domain dies immediately.

Keith