--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compiler-rt/test/tsan/unaligned_norace.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,84 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+uint64_t objs[8*3*3*2][3];
+
+extern "C" {
+void __tsan_unaligned_read2(void *addr);
+void __tsan_unaligned_read4(void *addr);
+void __tsan_unaligned_read8(void *addr);
+void __tsan_unaligned_write2(void *addr);
+void __tsan_unaligned_write4(void *addr);
+void __tsan_unaligned_write8(void *addr);
+}
+
+static void access(char *p, int sz, int rw) {
+  if (rw) {
+    switch (sz) {
+    case 0: __tsan_unaligned_write2(p); break;
+    case 1: __tsan_unaligned_write4(p); break;
+    case 2: __tsan_unaligned_write8(p); break;
+    default: exit(1);
+    }
+  } else {
+    switch (sz) {
+    case 0: __tsan_unaligned_read2(p); break;
+    case 1: __tsan_unaligned_read4(p); break;
+    case 2: __tsan_unaligned_read8(p); break;
+    default: exit(1);
+    }
+  }
+}
+
+static int accesssize(int sz) {
+  switch (sz) {
+  case 0: return 2;
+  case 1: return 4;
+  case 2: return 8;
+  }
+  exit(1);
+}
+
+void Test(bool main) {
+  uint64_t *obj = objs[0];
+  for (int off = 0; off < 8; off++) {
+    for (int sz1 = 0; sz1 < 3; sz1++) {
+      for (int sz2 = 0; sz2 < 3; sz2++) {
+        for (int rw = 0; rw < 2; rw++) {
+          char *p = (char*)obj + off;
+          if (main) {
+            // printf("thr=%d off=%d sz1=%d sz2=%d rw=%d p=%p\n",
+            //        main, off, sz1, sz2, rw, p);
+            access(p, sz1, true);
+          } else {
+            p += accesssize(sz1);
+            // printf("thr=%d off=%d sz1=%d sz2=%d rw=%d p=%p\n",
+            //        main, off, sz1, sz2, rw, p);
+            access(p, sz2, rw);
+          }
+          obj += 3;
+        }
+      }
+    }
+  }
+}
+
+void *Thread(void *p) {
+  (void)p;
+  Test(false);
+  return 0;
+}
+
+int main() {
+  pthread_t th;
+  pthread_create(&th, 0, Thread, 0);
+  Test(true);
+  pthread_join(th, 0);
+  fprintf(stderr, "OK\n");
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer:
+// CHECK: OK