Index: lib/asan/asan_posix.cc
===================================================================
--- lib/asan/asan_posix.cc
+++ lib/asan/asan_posix.cc
@@ -40,29 +40,50 @@
 
 // ---------------------- TSD ---------------- {{{1
 
+#if SANITIZER_FREEBSD
+static __thread void *_tsd_data;
+#else
 static pthread_key_t tsd_key;
 static bool tsd_key_inited = false;
+#endif
 void AsanTSDInit(void (*destructor)(void *tsd)) {
+#if SANITIZER_FREEBSD
+  DCHECK(destructor == &PlatformTSDDtor);
+  _tsd_data = nullptr;
+#else
   CHECK(!tsd_key_inited);
   tsd_key_inited = true;
   CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
+#endif
 }
 
 void *AsanTSDGet() {
+#if SANITIZER_FREEBSD
+  return _tsd_data;
+#else
   CHECK(tsd_key_inited);
   return pthread_getspecific(tsd_key);
+#endif
 }
 
 void AsanTSDSet(void *tsd) {
+#if SANITIZER_FREEBSD
+  _tsd_data = tsd;
+#else
   CHECK(tsd_key_inited);
   pthread_setspecific(tsd_key, tsd);
+#endif
 }
 
 void PlatformTSDDtor(void *tsd) {
   AsanThreadContext *context = (AsanThreadContext*)tsd;
   if (context->destructor_iterations > 1) {
     context->destructor_iterations--;
+#if SANITIZER_FREEBSD
+    _tsd_data = tsd;
+#else
     CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
+#endif
     return;
   }
   AsanThread::TSDDtor(tsd);