1 files changed, 17 insertions, 0 deletions
diff --git a/test/msan/errno.cc b/test/msan/errno.cc
new file mode 100644
index 0000000000000..8af8eb5ee6f93
--- /dev/null
+++ b/test/msan/errno.cc
@@ -0,0 +1,17 @@
+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %run %t
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+  int x;
+  int *volatile p = &x;
+  errno = *p;
+  int res = read(-1, 0, 0);
+  assert(res == -1);
+  if (errno) printf("errno %d\n", errno);
+  return 0;
+}