1 files changed, 47 insertions, 0 deletions
diff --git a/compiler-rt/test/tsan/map32bit.cpp b/compiler-rt/test/tsan/map32bit.cpp
new file mode 100644
index 00000000000..8aef27bc190
--- /dev/null
+++ b/compiler-rt/test/tsan/map32bit.cpp
@@ -0,0 +1,47 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
+#include "test.h"
+#include <stdint.h>
+#include <errno.h>
+#include <sys/mman.h>
+
+// Test for issue:
+// https://github.com/google/sanitizers/issues/412
+
+// MAP_32BIT flag for mmap is supported only for x86_64.
+// XFAIL: mips
+// XFAIL: aarch64
+// XFAIL: powerpc64
+
+// MAP_32BIT doesn't exist on OS X and NetBSD.
+// UNSUPPORTED: darwin,netbsd
+
+void *Thread(void *ptr) {
+  *(int*)ptr = 42;
+  barrier_wait(&barrier);
+  return 0;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  void *ptr = mmap(0, 128 << 10, PROT_READ|PROT_WRITE,
+      MAP_32BIT|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+  fprintf(stderr, "ptr=%p\n", ptr);
+  if (ptr == MAP_FAILED) {
+    fprintf(stderr, "mmap failed: %d\n", errno);
+    return 1;
+  }
+  if ((uintptr_t)ptr >= (1ull << 32)) {
+    fprintf(stderr, "ptr is too high\n");
+    return 1;
+  }
+  pthread_t t;
+  pthread_create(&t, 0, Thread, ptr);
+  barrier_wait(&barrier);
+  *(int*)ptr = 42;
+  pthread_join(t, 0);
+  munmap(ptr, 128 << 10);
+  fprintf(stderr, "DONE\n");
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK: DONE