2 files changed, 4 insertions, 0 deletions

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 6a5373868a98..c5f3c6613b6d 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -115,7 +115,9 @@ static void keventd_create_kthread(void *_create)
                 create->result = ERR_PTR(pid);
         } else {
                 wait_for_completion(&create->started);
+                read_lock(&tasklist_lock);
                 create->result = find_task_by_pid(pid);
+                read_unlock(&tasklist_lock);
         }
         complete(&create->done);
 }
diff --git a/mm/vmscan.c b/mm/vmscan.c
index fd572bbdc9f5..78865c849f8f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1356,7 +1356,9 @@ static int __init kswapd_init(void)
 
                 pid = kernel_thread(kswapd, pgdat, CLONE_KERNEL);
                 BUG_ON(pid < 0);
+                read_lock(&tasklist_lock);
                 pgdat->kswapd = find_task_by_pid(pid);
+                read_unlock(&tasklist_lock);
         }
         total_memory = nr_free_pagecache_pages();
         hotcpu_notifier(cpu_callback, 0);