diff --git a/Worker.php b/Worker.php
index 08e7dd6a8..c0dd8972a 100644
--- a/Worker.php
+++ b/Worker.php
@@ -934,6 +934,8 @@ protected static function forkOneWorker($worker)
             $worker->setUserAndGroup();
             $worker->id = $id;
             $worker->run();
+            $err = new Exception('event-loop exited');
+            self::log($err);
             exit(250);
         } else {
             throw new Exception("forkOneWorker fail");