Cause: Previously hypervkvpd registered to two NetLink multicast groups and one of them was group used by 'cgred'.
When hypervkvpd received a NetLink message (from cgred) it interpreted it blindly as its own. This caused hypervkvpd to segfault.
Hypervkvpd now registers only to its own NetLink multicast group and checks type of incoming NetLink message.
Hypervkvpd does not segfault any more when 'cgred' is running.