XENMEM_aquire_resources Error Path DoS (XSA-334)

A denial of service DoS vulnerability exists in Xen servers XENMEMacquireresource due to an error path exiting without releasing an RCU Read, Copy, Update reference. An authenticated, local attacker can exploit this issue, via a malicious HVM stubdomain which can cause an RCU reference to be...

pvcreate --restorefile fails "/dev/sdx device not found or ignored by filtering" in XenServer

When trying to restore the lvm metadata on a Physical volume from backup using the command pvcreate --restorefile, it is failing with the error /dev/sdx device not found...