When dealing with the grant map space of add-to-physmap operations,
ARM specific code recognizes a number of error conditions, but fails
to release a lock being held on the respective exit paths.
A malicious guest administrator can cause a denial of service.
Specifically, prevent use of a physical CPU for an indefinite period
Only affects ARM architectures.
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 1503678]