diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2c5cccb..4766bb6 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1269,7 +1269,7 @@ static int attach_task_by_pid(struct cgroup *cgrp, char *pidbuf)
 
 	if (pid) {
 		rcu_read_lock();
-		tsk = find_task_by_pid(pid);
+		tsk = find_task_by_vpid(pid);
 		if (!tsk || tsk->flags & PF_EXITING) {
 			rcu_read_unlock();
 			return -ESRCH;
@@ -1955,7 +1955,7 @@ static int pid_array_load(pid_t *pidarray, int npids, struct cgroup *cgrp)
 	while ((tsk = cgroup_iter_next(cgrp, &it))) {
 		if (unlikely(n == npids))
 			break;
-		pidarray[n++] = task_pid_nr(tsk);
+		pidarray[n++] = task_pid_vnr(tsk);
 	}
 	cgroup_iter_end(cgrp, &it);
 	return n;