Start of XEN domU with vhostmd device not possible - Red Hat Customer Portal

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Issue

A XEN domU cannot be started if a vhostmd device is attached to the domU
The following error is shown during startup:

Error: Device <number> (vbd) could not be connected. /etc/xen/scripts/block failed; error detected.

vhostmd service is up and running, and /dev/shm/vhostmd0 is accessible as well. Still the above error is shown during startup of the domU.
After removing the vhostmd device from the config the domU does start again.

Environment

Red Hat Enterprise Linux (RHEL) 5

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