XEN fails to run VM due to failure to open new loopback device after upgrade to RHEL 5.11
Issue
Due to a regression in udev XEN might fail to start a VM after upgrade to RHEL 5.11. This appears as a failure to open new loopback device
because loopback devices are not correctly released back to pool of free loopback devices.
Environment
Red Hat Enterprise Linux (RHEL) - version 5.11
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