diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 44f0cda7e72e44bb9ae47e6fc42fd284ceb430ab..a393c308bb290d1a0827310653ed205312857f34 100644
--- a/arch/s390/mm/fault.c
+++ b/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);