1 files changed, 8 insertions, 3 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3e6f78c6687..ffee827fa22 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -764,10 +764,10 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
 
 static void __clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-        if (cfs_rq->last == se)
+        if (!se || cfs_rq->last == se)
                 cfs_rq->last = NULL;
 
-        if (cfs_rq->next == se)
+        if (!se || cfs_rq->next == se)
                 cfs_rq->next = NULL;
 }
 
@@ -1646,8 +1646,13 @@ static struct task_struct *pick_next_task_fair(struct rq *rq)
                 /*
                  * If se was a buddy, clear it so that it will have to earn
                  * the favour again.
+                 *
+                 * If se was not a buddy, clear the buddies because neither
+                 * was elegible to run, let them earn it again.
+                 *
+                 * IOW. unconditionally clear buddies.
                  */
-                __clear_buddies(cfs_rq, se);
+                __clear_buddies(cfs_rq, NULL);
                 set_next_entity(cfs_rq, se);
                 cfs_rq = group_cfs_rq(se);
         } while (cfs_rq);