cluster: avoid unexpect scheduling job start (tikv#8794)

ref tikv#8781

Signed-off-by: lhy1024 <[email protected]>

server/cluster/cluster.go

@@ -458,7 +458,13 @@ func (c *RaftCluster) runServiceCheckJob() {
 			log.Info("service check job is stopped")
 			return
 		case <-schedulingTicker.C:
-			c.checkSchedulingService()
+			// ensure raft cluster is running
+			// avoid unexpected startSchedulingJobs when raft cluster is stopping
+			c.RLock()
+			if c.running {
+				c.checkSchedulingService()
+			}
+			c.RUnlock()
 		case <-tsoTicker.C:
 			// ensure raft cluster is running
 			// avoid unexpected startTSOJobsIfNeeded when raft cluster is stopping