[kube-proxy/ipvs] Do not try to delete RS already in termination list

pkg/proxy/ipvs/proxier.go

@@ -1643,6 +1643,10 @@ func (proxier *Proxier) cleanLegacyService(activeServices map[string]bool, curre
 			// Applying graceful termination to all real servers
 			for _, rs := range rsList {
 				uniqueRS := GetUniqueRSName(svc, rs)
+				// If RS is already in the graceful termination list, no need to add it again
+				if proxier.gracefuldeleteManager.InTerminationList(uniqueRS) {
+					continue
+				}
 				klog.V(5).Infof("Using graceful delete to delete: %v", uniqueRS)
 				if err := proxier.gracefuldeleteManager.GracefulDeleteRS(svc, rs); err != nil {
 					klog.Errorf("Failed to delete destination: %v, error: %v", uniqueRS, err)