Index: compiler-rt/trunk/lib/tsan/rtl/tsan_platform_mac.cc
===================================================================
--- compiler-rt/trunk/lib/tsan/rtl/tsan_platform_mac.cc
+++ compiler-rt/trunk/lib/tsan/rtl/tsan_platform_mac.cc
@@ -230,6 +230,14 @@
 #endif
 
 void InitializePlatformEarly() {
+#if defined(__aarch64__)
+  uptr max_vm = GetMaxVirtualAddress() + 1;
+  if (max_vm != kHiAppMemEnd) {
+    Printf("ThreadSanitizer: unsupported vm address limit %p, expected %p.\n",
+           max_vm, kHiAppMemEnd);
+    Die();
+  }
+#endif
 }
 
 void InitializePlatform() {