--- a/libunwind/test/libunwind_02.pass.cpp	Wed Jul 21 10:27:27 2021 +0900
+++ b/libunwind/test/libunwind_02.pass.cpp	Wed Nov 09 17:45:10 2022 +0900
@@ -1,3 +1,16 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// TODO: Figure out why this fails with Memory Sanitizer.
+// XFAIL: msan
+
+#undef NDEBUG
 #include <assert.h>
 #include <stdlib.h>
 #include <unwind.h>