diff --git a/[refs] b/[refs]
index 6d49f4b30c83..cd8a327f9f16 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7cf7db8df0b78076eafa4ead47559344ca7b7a43
+refs/heads/master: d4581a239a40319205762b76c01eb6363f277efa
diff --git a/trunk/kernel/sys.c b/trunk/kernel/sys.c
index 9968c5fb55b9..bc1dc61c31ed 100644
--- a/trunk/kernel/sys.c
+++ b/trunk/kernel/sys.c
@@ -163,6 +163,7 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
 	if (niceval > 19)
 		niceval = 19;
 
+	rcu_read_lock();
 	read_lock(&tasklist_lock);
 	switch (which) {
 		case PRIO_PROCESS:
@@ -200,6 +201,7 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
 	}
 out_unlock:
 	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 out:
 	return error;
 }