From 6ab78eeddfba6145410ff7072fef90b737a76f8f Mon Sep 17 00:00:00 2001
From: Fei Deng <duke8253@gmail.com>
Date: Sun, 3 Feb 2019 15:57:44 -0600
Subject: [PATCH] grab the lock if there is one

---
 src/traffic_server/traffic_server.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/traffic_server/traffic_server.cc b/src/traffic_server/traffic_server.cc
index e607538e2ef..712328bbf33 100644
--- a/src/traffic_server/traffic_server.cc
+++ b/src/traffic_server/traffic_server.cc
@@ -224,6 +224,7 @@ struct AutoStopCont : public Continuation {
   {
     APIHook *hook = lifecycle_hooks->get(TS_LIFECYCLE_SHUTDOWN_HOOK);
     while (hook) {
+      SCOPED_MUTEX_LOCK(lock, hook->m_cont->mutex, this_ethread());
       hook->invoke(TS_EVENT_LIFECYCLE_SHUTDOWN, nullptr);
       hook = hook->next();
     }