diff --git a/[refs] b/[refs]
index 5a2e28cddec1..31ee14784e60 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a77c64c1a641950626181b4857abb701d8f38ccc
+refs/heads/master: bac9c66cd25e134077b284fc59bee6e5a8475d33
diff --git a/trunk/arch/s390/mm/fault.c b/trunk/arch/s390/mm/fault.c
index 44f0cda7e72e..a393c308bb29 100644
--- a/trunk/arch/s390/mm/fault.c
+++ b/trunk/arch/s390/mm/fault.c
@@ -355,6 +355,7 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
 	up_read(&mm->mmap_sem);
 	if (tsk->pid == 1) {
 		yield();
+		down_read(&mm->mmap_sem);
 		goto survive;
 	}
 	printk("VM: killing process %s\n", tsk->comm);