diff --git a/[refs] b/[refs]
index 6cc9dc10d9e0..5777b2283f70 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ce289e89726948b50a58c9e8f4e81174a8c9c254
+refs/heads/master: 4cd69b986ebf0f8da93f82ffbb89c032ee09c2e1
diff --git a/trunk/kernel/kexec.c b/trunk/kernel/kexec.c
index c8a4370e2a34..cf3797b76786 100644
--- a/trunk/kernel/kexec.c
+++ b/trunk/kernel/kexec.c
@@ -1503,7 +1503,8 @@ int kernel_kexec(void)
 	}
 
  Unlock:
-	xchg(&kexec_lock, 0);
+	if (!xchg(&kexec_lock, 0))
+		BUG();
 
 	return error;
 }