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diff --git a/libmudflap/testsuite/libmudflap.c/fail21-frag.c b/libmudflap/testsuite/libmudflap.c/fail21-frag.c
new file mode 100644
index 00000000..4ab4a09f
--- /dev/null
+++ b/libmudflap/testsuite/libmudflap.c/fail21-frag.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+int main ()
+{
+ int *bar = (int *) malloc (sizeof (int));
+/* Make an access here to get &foo into the lookup cache.  */
+*bar = 5;
+__mf_watch (bar, sizeof(int));
+/* This access should trigger the watch violation.  */
+*bar = 10;
+/* NOTREACHED */
+return 0;
+}
+/* { dg-output "mudflap violation 1.*watch.*" } */
+/* { dg-output "Nearby object 1.*" } */
+/* { dg-output "mudflap object.*malloc region.*" } */
+/* { dg-do run { xfail *-*-* } } */