From d59a1ce2acafdf6f288f5448e78ec78bb832cd8c Mon Sep 17 00:00:00 2001
From: Pavel Melkozerov <p.melkozerov@yadro.com>
Date: Sat, 29 Jun 2024 14:59:31 +0300
Subject: [PATCH] reactor: fix crash during metrics gathering

The crash is caused by statistics request while scheduling_group is
removed. The tasks_pending metric gathering triggers
reactor::pending_task_count() call. This call causes null pointer
derefence as the task queue pointer has been reset in
reactor::destroy_scheduling_group()
---
 src/core/reactor.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/reactor.cc b/src/core/reactor.cc
index fcc6b0b82ad..ee606622243 100644
--- a/src/core/reactor.cc
+++ b/src/core/reactor.cc
@@ -2545,7 +2545,9 @@ uint64_t
 reactor::pending_task_count() const {
     uint64_t ret = 0;
     for (auto&& tq : _task_queues) {
-        ret += tq->_q.size();
+        if (tq) {
+            ret += tq->_q.size();
+        }
     }
     return ret;
 }