--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/asan/bitfield-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,25 @@
+/* Check that Asan correctly instruments bitfields with round offset.  */
+
+/* { dg-do run } */
+/* { dg-shouldfail "asan" } */
+
+struct A
+{
+  char base;
+  int : 8;
+  int x : 8;
+};
+
+int __attribute__ ((noinline, noclone))
+f (void *p) {
+  return ((struct A *)p)->x;
+}
+
+int
+main ()
+{
+  char a = 0;
+  return f (&a);
+}
+
+/* { dg-output "ERROR: AddressSanitizer: stack-buffer-overflow" } */