I encountered an error while running the `cgroup_skb` example in Linux 4.9, error=`loading objects: field CountEgressPackets: program count_egress_packets: load program: argument list too long`. 

Although cgroup_skb dont support with Linux 4.9, but README.md mentions that working with Linux >= 4.9, so loadBpfObjects() should be ok but failed.

So i want to know whether Linux 4.9 is supported? 

Tks.