--- x/mm/oom_kill.c
+++ y/mm/oom_kill.c
@@ -997,6 +997,8 @@ static void __oom_kill_process(struct ta
 		queue_oom_reaper(victim);
 
 	mmdrop(mm);
+	write_lock_irq(&tasklist_lock);
+	write_unlock_irq(&tasklist_lock);
 	put_task_struct(victim);
 }
 
@@ -1031,6 +1033,8 @@ static void oom_kill_process(struct oom_
 		mark_oom_victim(victim);
 		queue_oom_reaper(victim);
 		task_unlock(victim);
+		write_lock_irq(&tasklist_lock);
+		write_unlock_irq(&tasklist_lock);
 		put_task_struct(victim);
 		return;
 	}