daemon: service is deleted in cache when deleting endpints

Fixes: #29580

Signed-off-by: xyz-li <hui0787411@163.com>

pkg/maps/lbmap/lbmap.go

@@ -128,12 +128,7 @@ func (lbmap *LBBPFMap) upsertServiceProto(p *datapathTypes.UpsertServiceParams,
 		return fmt.Errorf("Unable to update reverse NAT %+v => %+v: %s", revNATKey, revNATValue, err)
 	}
 
-	if err := updateMasterService(svcKey, svcVal.New().(ServiceValue), len(backends), int(p.ID), p.Type, p.ExtLocal, p.IntLocal, p.NatPolicy,
-		p.SessionAffinity, p.SessionAffinityTimeoutSec, p.CheckSourceRange, p.L7LBProxyPort, p.LoopbackHostport); err != nil {
-		deleteRevNatLocked(revNATKey)
-		return fmt.Errorf("Unable to update service %+v: %s", svcKey, err)
-	}
-
+	// It must be executed before updateMasterService, or the service in cache will be deleted.
 	if backendsOk {
 		for i := slot; i <= p.PrevBackendsCount; i++ {
 			svcKey.SetBackendSlot(i)
@@ -146,6 +141,12 @@ func (lbmap *LBBPFMap) upsertServiceProto(p *datapathTypes.UpsertServiceParams,
 		}
 	}
 
+	if err := updateMasterService(svcKey, svcVal.New().(ServiceValue), len(backends), int(p.ID), p.Type, p.ExtLocal, p.IntLocal, p.NatPolicy,
+		p.SessionAffinity, p.SessionAffinityTimeoutSec, p.CheckSourceRange, p.L7LBProxyPort, p.LoopbackHostport); err != nil {
+		deleteRevNatLocked(revNATKey)
+		return fmt.Errorf("Unable to update service %+v: %s", svcKey, err)
+	}
+
 	return nil
 }