This bug is a backport clone of [Bugzilla Bug 1983056](https://bugzilla.redhat.com/show_bug.cgi?id=1983056). The following is the description of the original bug:
—
Description of problem:

During upgrade of 4.5.40 to 4.6.31 the CNI is restarting due to unable to plug the VIF provided as it is already being used by another Pod.

2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service [-] Error when processing addNetwork request. CNI Params:

{'CNI_IFNAME': 'eth0', 'CNI_NETNS': '/var/run/netns/0420f2a3-d2fe-40e6-86f0-9a38a17c933a', 'CNI_PATH': '/opt/multus/bin:/var/lib/cni/bin:/usr/libexec/cni', 'CNI_COMMAND': 'ADD', 'CNI_CONTAINERID': '73eee9240ae6bcfec8b539fa2b12c8e82f51f8a95f29aaaedc95e4e05f7cb734', 'CNI_ARGS': 'IgnoreUnknown=true;K8S_POD_NAMESPACE=openshift-monitoring;K8S_POD_NAME=prometheus-k8s-0;K8S_POD_INFRA_CONTAINER_ID=73eee9240ae6bcfec8b539fa2b12c8e82f51f8a95f29aaaedc95e4e05f7cb734'}

: pyroute2.netlink.exceptions.NetlinkError: (17, 'File exists')
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service Traceback (most recent call last):
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/kuryr_kubernetes/cni/daemon/service.py", line 82, in add
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service vif = self.plugin.add(params)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/kuryr_kubernetes/cni/plugins/k8s_cni_registry.py", line 75, in add
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service vifs = self._do_work(params, b_base.connect, timeout)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/kuryr_kubernetes/cni/plugins/k8s_cni_registry.py", line 184, in _do_work
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service container_id=params.CNI_CONTAINERID)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/kuryr_kubernetes/cni/binding/base.py", line 156, in connect
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service driver.connect(vif, ifname, netns, container_id)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/kuryr_kubernetes/cni/binding/nested.py", line 126, in connect
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service iface.net_ns_fd = utils.convert_netns(netns)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/ipdb/transactional.py", line 209, in _exit_
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service self.commit()
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/ipdb/interfaces.py", line 650, in commit
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service raise newif
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/ipdb/interfaces.py", line 589, in commit
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service self.nl.link('add', **request)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/iproute/linux.py", line 1163, in link
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service msg_flags=msg_flags)
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/netlink/nlsocket.py", line 373, in nlm_request
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service return tuple(self._genlm_request(*argv, **kwarg))
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/netlink/nlsocket.py", line 864, in nlm_request
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service callback=callback):
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/netlink/nlsocket.py", line 376, in get
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service return tuple(self._genlm_get(*argv, **kwarg))
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service File "/usr/lib/python3.6/site-packages/pyroute2/netlink/nlsocket.py", line 701, in get
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service raise msg['header']['error']
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service pyroute2.netlink.exceptions.NetlinkError: (17, 'File exists')
2021-07-16 10:55:02.580 232 ERROR kuryr_kubernetes.cni.daemon.service
2021-07-16 10:55:02.585 232 INFO werkzeug [-] 127.0.0.1 - - [16/Jul/2021 10:55:02] "POST /addNetwork HTTP/1.1" 500 -
2021-07-16 10:55:02.656 251 INFO os_vif [-] Successfully unplugged vif VIFVlanNested(active=True,address=fa:16:3e:c1:cd:25,has_traffic_filtering=False,id=88bdb7f9-65e6-4c54-83d1-73341876da08,network=Network(cc5c0761-5f89-42b8-a4fc-0d829eba818d),plugin='noop',port_profile=<?>,preserve_on_delete=False,vif_name='tap88bdb7f9-65',vlan_id=2482)

The prometheus Pod is configured to used the same IP as the alert Pod, and the alert Pod is using IP different than the one specified on annotation:

[stack@undercloud-0 ~]$ oc get po prometheus-k8s-0 -n openshift-monitoring -o yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
openshift.io/scc: anyuid
openstack.org/kuryr-pod-label: '

{"app": "prometheus", "controller-revision-hash": "prometheus-k8s-5949f47544", "prometheus": "k8s", "statefulset.kubernetes.io/pod-name": "prometheus-k8s-0"}

'
openstack.org/kuryr-vif: '{"versioned_object.changes": ["default_vif"], "versioned_object.data":
{"additional_vifs": {}, "default_vif": {"versioned_object.changes": ["has_traffic_filtering",
"plugin", "active", "vif_name", "preserve_on_delete", "network", "id", "address",
"vlan_id"], "versioned_object.data": {"active": true, "address": "fa:16:3e:c1:cd:25",
"has_traffic_filtering": false, "id": "88bdb7f9-65e6-4c54-83d1-73341876da08",
"network": {"versioned_object.changes": ["mtu", "multi_host", "subnets", "label",
"id", "should_provide_bridge", "should_provide_vlan"], "versioned_object.data":
{"id": "cc5c0761-5f89-42b8-a4fc-0d829eba818d", "label": "ns/openshift-monitoring-net",
"mtu": 1442, "multi_host": false, "should_provide_bridge": false, "should_provide_vlan":
false, "subnets": {"versioned_object.changes": ["objects"], "versioned_object.data":
{"objects": [{"versioned_object.changes": ["ips", "gateway", "routes", "cidr",
"dns"], "versioned_object.data": {"cidr": "10.128.8.0/23", "dns": [], "gateway":
"10.128.8.1", "ips": {"versioned_object.changes": ["objects"], "versioned_object.data":
{"objects": [{"versioned_object.changes": ["address"], "versioned_object.data":

{"address": "10.128.9.175"}

, "versioned_object.name": "FixedIP", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}]}, "versioned_object.name": "FixedIPList",
"versioned_object.namespace": "os_vif", "versioned_object.version": "1.0"},
"routes": {"versioned_object.changes": ["objects"], "versioned_object.data":

{"objects": []}

, "versioned_object.name": "RouteList", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}}, "versioned_object.name": "Subnet",
"versioned_object.namespace": "os_vif", "versioned_object.version": "1.0"}]},
"versioned_object.name": "SubnetList", "versioned_object.namespace": "os_vif",
"versioned_object.version": "1.0"}}, "versioned_object.name": "Network", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.1"}, "plugin": "noop", "preserve_on_delete":
false, "vif_name": "tap88bdb7f9-65", "vlan_id": 2482}, "versioned_object.name":
"VIFVlanNested", "versioned_object.namespace": "os_vif", "versioned_object.version":
"1.0"}}, "versioned_object.name": "PodState", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}'
creationTimestamp: "2021-07-15T12:24:52Z"
generateName: prometheus-k8s-
labels:
app: prometheus
controller-revision-hash: prometheus-k8s-5949f47544
prometheus: k8s
statefulset.kubernetes.io/pod-name: prometheus-k8s-0
name: prometheus-k8s-0
namespace: openshift-monitoring
ownerReferences:

• apiVersion: apps/v1
  blockOwnerDeletion: true
  controller: true
  kind: StatefulSet
  name: prometheus-k8s
  uid: 08334f30-2552-499b-9245-e4f61fe92a76
  resourceVersion: "112100"
  selfLink: /api/v1/namespaces/openshift-monitoring/pods/prometheus-k8s-0
  uid: 1087ca8f-9f00-486a-8471-60956e9c27a4

[stack@undercloud-0 ~]$ oc get po -A -o wide |grep 10.128.9.175
openshift-monitoring alertmanager-main-2 5/5 Running 0 22h 10.128.9.175 ostest-f57bt-worker-vprrk <none> <none>
[stack@undercloud-0 ~]$ oc get po alertmanager-main-2 -n openshift-monitoring -o yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
k8s.v1.cni.cncf.io/network-status: |-
[{
"name": "kuryr",
"interface": "eth0",
"ips": [
"10.128.9.175"
],
"mac": "fa:16:3e:c1:cd:25",
"default": true,
"dns": {}
}]
k8s.v1.cni.cncf.io/networks-status: |-
[{
"name": "kuryr",
"interface": "eth0",
"ips": [
"10.128.9.175"
],
"mac": "fa:16:3e:c1:cd:25",
"default": true,
"dns": {}
}]
openshift.io/scc: anyuid
openstack.org/kuryr-pod-label: '

{"alertmanager": "main", "app": "alertmanager", "controller-revision-hash": "alertmanager-main-5548759bbd", "statefulset.kubernetes.io/pod-name": "alertmanager-main-2"}

'
openstack.org/kuryr-vif: '{"versioned_object.changes": ["default_vif"], "versioned_object.data":
{"additional_vifs": {}, "default_vif": {"versioned_object.changes": ["active",
"has_traffic_filtering", "network", "address", "id", "preserve_on_delete", "vlan_id",
"plugin", "vif_name"], "versioned_object.data": {"active": true, "address":
"fa:16:3e:77:a3:12", "has_traffic_filtering": false, "id": "f6dd52db-40e1-4339-a7e6-1e2bd2f6f772",
"network": {"versioned_object.changes": ["multi_host", "label", "should_provide_vlan",
"should_provide_bridge", "mtu", "id", "subnets"], "versioned_object.data": {"id":
"cc5c0761-5f89-42b8-a4fc-0d829eba818d", "label": "ns/openshift-monitoring-net",
"mtu": 1442, "multi_host": false, "should_provide_bridge": false, "should_provide_vlan":
false, "subnets": {"versioned_object.changes": ["objects"], "versioned_object.data":
{"objects": [{"versioned_object.changes": ["routes", "dns", "cidr", "gateway",
"ips"], "versioned_object.data": {"cidr": "10.128.8.0/23", "dns": [], "gateway":
"10.128.8.1", "ips": {"versioned_object.changes": ["objects"], "versioned_object.data":
{"objects": [{"versioned_object.changes": ["address"], "versioned_object.data":

{"address": "10.128.9.238"}

, "versioned_object.name": "FixedIP", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}]}, "versioned_object.name": "FixedIPList",
"versioned_object.namespace": "os_vif", "versioned_object.version": "1.0"},
"routes": {"versioned_object.changes": ["objects"], "versioned_object.data":

{"objects": []}

, "versioned_object.name": "RouteList", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}}, "versioned_object.name": "Subnet",
"versioned_object.namespace": "os_vif", "versioned_object.version": "1.0"}]},
"versioned_object.name": "SubnetList", "versioned_object.namespace": "os_vif",
"versioned_object.version": "1.0"}}, "versioned_object.name": "Network", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.1"}, "plugin": "noop", "preserve_on_delete":
false, "vif_name": "tapf6dd52db-40", "vlan_id": 3914}, "versioned_object.name":
"VIFVlanNested", "versioned_object.namespace": "os_vif", "versioned_object.version":
"1.0"}}, "versioned_object.name": "PodState", "versioned_object.namespace":
"os_vif", "versioned_object.version": "1.0"}'
creationTimestamp: "2021-07-15T12:23:41Z"
generateName: alertmanager-main-
labels:
alertmanager: main
app: alertmanager
controller-revision-hash: alertmanager-main-5548759bbd
statefulset.kubernetes.io/pod-name: alertmanager-main-2
name: alertmanager-main-2
namespace: openshift-monitoring

(shiftstack) [stack@undercloud-0 ~]$ openstack port list |grep 10.128.9.175

(shiftstack) [stack@undercloud-0 ~]$ openstack port list |grep 10.128.9.238

(shiftstack) [stack@undercloud-0 ~]$ oc get co
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE
authentication 4.6.31 True False False 22h
cloud-credential 4.6.31 True False False 26h
cluster-autoscaler 4.6.31 True False False 25h
config-operator 4.6.31 True False False 25h
console 4.6.31 True False False 22h
csi-snapshot-controller 4.6.31 True False False 25h
dns 4.5.40 True False False 25h
etcd 4.6.31 True False False 25h
image-registry 4.6.31 True False False 25h
ingress 4.6.31 True False False 22h
insights 4.6.31 True False False 25h
kube-apiserver 4.6.31 True False False 25h
kube-controller-manager 4.6.31 True False False 25h
kube-scheduler 4.6.31 True False False 25h
kube-storage-version-migrator 4.6.31 True False False 25h
machine-api 4.6.31 True False False 25h
machine-approver 4.6.31 True False False 25h
machine-config 4.5.40 True False False 23h
marketplace 4.6.31 True False False 22h
monitoring 4.5.40 False True True 22h
network 4.5.40 True True False 25h
node-tuning 4.6.31 True False False 22h
openshift-apiserver 4.6.31 True False False 25h
openshift-controller-manager 4.6.31 True False False 22h
openshift-samples 4.6.31 True False False 22h
operator-lifecycle-manager 4.6.31 True False False 25h
operator-lifecycle-manager-catalog 4.6.31 True False False 25h
operator-lifecycle-manager-packageserver 4.6.31 True False False 22h
service-ca 4.6.31 True False False 25h
storage 4.6.31 True False False 22h

(shiftstack) [stack@undercloud-0 ~]$ oc get po -A -o wide |grep 10.128.9.238 |wc -l
0

The same issue would be possible on 3.11 as it's also based on Annotations.

Version-Release number of selected component (if applicable):

Red Hat OpenStack Platform release 16.1.6 GA
How reproducible:

Steps to Reproduce:
1.
2.
3.

Actual results:

Expected results:

Additional info: