diff -NurpP --minimal linux-4.9.76-vs2.3.9.4/kernel/nsproxy.c linux-4.9.76-vs2.3.9.5/kernel/nsproxy.c
--- linux-4.9.76-vs2.3.9.4/kernel/nsproxy.c	2018-01-13 02:23:13.000000000 +0000
+++ linux-4.9.76-vs2.3.9.5/kernel/nsproxy.c	2018-01-14 06:25:23.000000000 +0000
@@ -168,6 +168,8 @@ struct nsproxy *copy_nsproxy(struct nspr
 			get_pid_ns(ns->pid_ns_for_children);
 		if (ns->net_ns)
 			get_net(ns->net_ns);
+		if (ns->cgroup_ns)
+			get_cgroup_ns(ns->cgroup_ns);
 	}
 	return ns;
 }