diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 20a7e87..8da44a0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1530,6 +1530,8 @@
 	unsigned int points = 0;
 	struct task_struct *chosen = NULL;
 
+	mutex_lock(&oom_lock);
+
 	/*
 	 * If current has a pending SIGKILL or is exiting, then automatically
 	 * select it.  The goal is to allow it to allocate so that it may
@@ -1537,7 +1539,7 @@
 	 */
 	if (fatal_signal_pending(current) || task_will_free_mem(current)) {
 		mark_oom_victim(current);
-		return;
+		goto unlock;
 	}
 
 	check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL, memcg);
@@ -1564,7 +1566,7 @@
 				mem_cgroup_iter_break(memcg, iter);
 				if (chosen)
 					put_task_struct(chosen);
-				return;
+				goto unlock;
 			case OOM_SCAN_OK:
 				break;
 			};
@@ -1585,11 +1587,13 @@
 		css_task_iter_end(&it);
 	}
 
-	if (!chosen)
-		return;
-	points = chosen_points * 1000 / totalpages;
-	oom_kill_process(chosen, gfp_mask, order, points, totalpages, memcg,
-			 NULL, "Memory cgroup out of memory");
+	if (chosen) {
+		points = chosen_points * 1000 / totalpages;
+		oom_kill_process(chosen, gfp_mask, order, points, totalpages,
+				 memcg, NULL, "Memory cgroup out of memory");
+	}
+unlock:
+	mutex_unlock(&oom_lock);
 }
 
 #if MAX_NUMNODES > 1