diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index feb91177247c8deca3d59dac325db4712b1b98a2..27dd33566df801c66f9080ca6bc8bcc71d355119 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1530,6 +1530,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
 	cgroup_taskset_first(tset, &css);
 	cs = css_cs(css);
 
+	cpus_read_lock();
 	mutex_lock(&cpuset_mutex);
 
 	/* prepare for attach */
@@ -1585,6 +1586,7 @@ static void cpuset_attach(struct cgroup_taskset *tset)
 		wake_up(&cpuset_attach_wq);
 
 	mutex_unlock(&cpuset_mutex);
+	cpus_read_unlock();
 }
 
 /* The various types of files and directories in a cpuset file system */