From e47d92d6560ccd60fffbbc6ee94f113c6c4464df Mon Sep 17 00:00:00 2001
From: Fei Deng <duke8253@gmail.com>
Date: Wed, 15 May 2019 09:43:31 -0500
Subject: [PATCH] grab lock before invoke

---
 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 3d6c630f919..65b2a758b79 100644
--- a/src/traffic_server/traffic_server.cc
+++ b/src/traffic_server/traffic_server.cc
@@ -2103,6 +2103,7 @@ task_threads_started_callback()
 {
   APIHook *hook = lifecycle_hooks->get(TS_LIFECYCLE_TASK_THREADS_READY_HOOK);
   while (hook) {
+    SCOPED_MUTEX_LOCK(lock, hook->m_cont->mutex, this_ethread());
     hook->invoke(TS_EVENT_LIFECYCLE_TASK_THREADS_READY, nullptr);
     hook = hook->next();
   }