EgressIP was NOT migrated to correct workers after deleting machine it was assigned in GCP XPN cluster.

4.13.0-0.nightly-2023-03-29-235439

Always

1. Set up GCP XPN cluster.
2. Scale two new worker nodes
% oc scale --replicas=2 machineset huirwang-0331a-m4mws-worker-c -n openshift-machine-api        
machineset.machine.openshift.io/huirwang-0331a-m4mws-worker-c scaled

3. Wait the two new workers node ready.
 % oc get machineset -n openshift-machine-api
NAME                            DESIRED   CURRENT   READY   AVAILABLE   AGE
huirwang-0331a-m4mws-worker-a   1         1         1       1           86m
huirwang-0331a-m4mws-worker-b   1         1         1       1           86m
huirwang-0331a-m4mws-worker-c   2         2         2       2           86m
huirwang-0331a-m4mws-worker-f   0         0                             86m
% oc get nodes
NAME                                                          STATUS   ROLES                  AGE     VERSION
huirwang-0331a-m4mws-master-0.c.openshift-qe.internal         Ready    control-plane,master   82m     v1.26.2+dc93b13
huirwang-0331a-m4mws-master-1.c.openshift-qe.internal         Ready    control-plane,master   82m     v1.26.2+dc93b13
huirwang-0331a-m4mws-master-2.c.openshift-qe.internal         Ready    control-plane,master   82m     v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-a-hfqsn.c.openshift-qe.internal   Ready    worker                 71m     v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-b-vbqf2.c.openshift-qe.internal   Ready    worker                 71m     v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal   Ready    worker                 8m22s   v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-c-wnm4r.c.openshift-qe.internal   Ready    worker                 8m22s   v1.26.2+dc93b13
3. Label one new worker node as egress node
 % oc label node huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal k8s.ovn.org/egress-assignable="" 
node/huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal labeled

4. Create egressIP object
oc get egressIP
NAME         EGRESSIPS     ASSIGNED NODE                                                 ASSIGNED EGRESSIPS
egressip-1   10.0.32.100   huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal   10.0.32.100
5. Label second new worker node as egress node 
% oc label node huirwang-0331a-m4mws-worker-c-wnm4r.c.openshift-qe.internal k8s.ovn.org/egress-assignable="" 
node/huirwang-0331a-m4mws-worker-c-wnm4r.c.openshift-qe.internal labeled
6. Delete the assigned egress node
% oc delete machines.machine.openshift.io huirwang-0331a-m4mws-worker-c-rhbkr  -n openshift-machine-api
machine.machine.openshift.io "huirwang-0331a-m4mws-worker-c-rhbkr" deleted
 % oc get nodes
NAME                                                          STATUS   ROLES                  AGE   VERSION
huirwang-0331a-m4mws-master-0.c.openshift-qe.internal         Ready    control-plane,master   87m   v1.26.2+dc93b13
huirwang-0331a-m4mws-master-1.c.openshift-qe.internal         Ready    control-plane,master   86m   v1.26.2+dc93b13
huirwang-0331a-m4mws-master-2.c.openshift-qe.internal         Ready    control-plane,master   87m   v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-a-hfqsn.c.openshift-qe.internal   Ready    worker                 76m   v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-b-vbqf2.c.openshift-qe.internal   Ready    worker                 76m   v1.26.2+dc93b13
huirwang-0331a-m4mws-worker-c-wnm4r.c.openshift-qe.internal   Ready    worker                 13m   v1.26.2+dc93b13
29468 W0331 02:48:34.917391       1 egressip_healthcheck.go:162] Could not connect to huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal (10.129.4.2:9107): context       deadline exceeded
29469 W0331 02:48:34.917417       1 default_network_controller.go:903] Node: huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal is not ready, deleting it from egre      ss assignment
29470 I0331 02:48:34.917590       1 client.go:783]  "msg"="transacting operations" "database"="OVN_Northbound" "operations"="[{Op:update Table:Logical_Switch_Port Row:map[o      ptions:{GoMap:map[router-port:rtoe-GR_huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal]}] Rows:[] Columns:[] Mutations:[] Timeout:<nil> Where:[where column       _uuid == {6efd3c58-9458-44a2-a43b-e70e669efa72}] Until: Durable:<nil> Comment:<nil> Lock:<nil> UUIDName:}]"
29471 E0331 02:48:34.920766       1 egressip.go:993] Allocator error: EgressIP: egressip-1 assigned to node: huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal whi      ch is not reachable, will attempt rebalancing
29472 E0331 02:48:34.920789       1 egressip.go:997] Allocator error: EgressIP: egressip-1 assigned to node: huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal whi      ch is not ready, will attempt rebalancing
29473 I0331 02:48:34.920808       1 egressip.go:1212] Deleting pod egress IP status: {huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal 10.0.32.100} for EgressIP:       egressip-1

The egressIP was not migrated to correct worker
 oc get egressIP      
NAME         EGRESSIPS     ASSIGNED NODE                                                 ASSIGNED EGRESSIPS
egressip-1   10.0.32.100   huirwang-0331a-m4mws-worker-c-rhbkr.c.openshift-qe.internal   10.0.32.100

The egressIP should migrated to correct worker from deleted node.