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diff --git a/lib/asan/lit_tests/TestCases/use-after-poison.cc b/lib/asan/lit_tests/TestCases/use-after-poison.cc
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+++ b/lib/asan/lit_tests/TestCases/use-after-poison.cc
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+// Check that __asan_poison_memory_region works.
+// RUN: %clangxx_asan -O0 %s -o %t && not %t 2>&1 | FileCheck %s
+//
+// Check that we can disable it
+// RUN: ASAN_OPTIONS=allow_user_poisoning=0 %t
+
+#include <stdlib.h>
+
+extern "C" void __asan_poison_memory_region(void *, size_t);
+
+int main(int argc, char **argv) {
+ char *x = new char[16];
+ x[10] = 0;
+ __asan_poison_memory_region(x, 16);
+ int res = x[argc * 10]; // BOOOM
+ // CHECK: ERROR: AddressSanitizer: use-after-poison
+ // CHECK: main{{.*}}use-after-poison.cc:[[@LINE-2]]
+ delete [] x;
+ return res;
+}