diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 4708c06eba0a287f113cb55c6313e7a96a2b7a7a..01966adceced1a14fbe2c675fb5246edc2643a94 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2211,6 +2211,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
 	cgroup_taskset_first(tset, &css);
 	cs = css_cs(css);
 
+	cpus_read_lock();
 	percpu_down_write(&cpuset_rwsem);
 
 	/* prepare for attach */
@@ -2266,6 +2267,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
 		wake_up(&cpuset_attach_wq);
 
 	percpu_up_write(&cpuset_rwsem);
+	cpus_read_unlock();
 }
 
 /* The various types of files and directories in a cpuset file system */