// Try to delete rs before add it to graceful delete list
	ele := &listItem{
		VirtualServer: vs,
		RealServer:    rs,
	}
	deleted, err := m.deleteRsFunc(ele)
	if err != nil {
		klog.ErrorS(err, "Error in deleting real server", "realServer", ele)
	}
	if deleted {
		return nil
	}
	rs.Weight = 0
	err = m.ipvs.UpdateRealServer(vs, rs)
	if err != nil {