Index: lib/sanitizer_common/sanitizer_mac.cc
===================================================================
--- lib/sanitizer_common/sanitizer_mac.cc
+++ lib/sanitizer_common/sanitizer_mac.cc
@@ -336,8 +336,26 @@
   return 0;
 }
 
-void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
-void internal_join_thread(void *th) { }
+void *internal_start_thread(void(*func)(void *arg), void *arg) {
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000
+  // Start the thread with signals blocked, otherwise it can steal user signals.
+  __sanitizer_sigset_t set, old;
+  internal_sigfillset(&set);
+  internal_sigprocmask(SIG_SETMASK, &set, &old);
+  void *th;
+  real_pthread_create(&th, 0, (void*(*)(void *arg))func, arg);
+  internal_sigprocmask(SIG_SETMASK, &old, 0);
+  return th;
+#else
+  return 0;
+#endif
+}
+
+void internal_join_thread(void *th) {
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000
+  real_pthread_join(th, 0);
+#endif
+}
 
 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
   ucontext_t *ucontext = (ucontext_t*)context;