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diff --git a/test/asan/TestCases/strcasestr-1.c b/test/asan/TestCases/strcasestr-1.c
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+// Test haystack overflow in strcasestr function
+// RUN: %clang_asan %s -o %t && ASAN_OPTIONS=$ASAN_OPTIONS:strict_string_checks=true not %run %t 2>&1 | FileCheck %s
+
+// Test intercept_strstr asan option
+// Disable other interceptors because strlen may be called inside strcasestr
+// RUN: env ASAN_OPTIONS=$ASAN_OPTIONS:intercept_strstr=false:replace_str=false %run %t 2>&1
+
+// There's no interceptor for strcasestr on Windows
+// XFAIL: win32
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+ char *r = 0;
+ char s2[] = "c";
+ char s1[] = {'a', 'C'};
+ char s3 = 0;
+ r = strcasestr(s1, s2);
+ // CHECK:'s{{[1|3]}}' <== Memory access at offset {{[0-9]+ .*}}flows this variable
+ assert(r == s1 + 1);
+ return 0;
+}