Try again with POSIX_ENSURE

utils/s2n_init.c

@@ -89,7 +89,7 @@ int s2n_cleanup(void)
     /* If this is the main thread and atexit cleanup is unavailable,
      * perform final cleanup now */
     if (pthread_self() == main_thread && !atexit_cleanup) {
-        POSIX_ENSURE(s2n_cleanup_atexit_impl());
+        POSIX_ENSURE(s2n_cleanup_atexit_impl(), S2N_ERR_ATEXIT);
     }
     return 0;
 }