Bug 1852593

Description of problem:
Follow https://docs.openshift.com/container-platform/3.11/admin_guide/managing_networking.html#admin-guide-deploying-an-egress-router-pod to deploy egress router pod in v4.6/SDN, but egress router pod is stuck in Init:0/1 state

Version-Release number of selected component (if applicable):
4.6.0-0.nightly-2020-06-30-112422

How reproducible:
Always

Steps to Reproduce:
[weliang@weliang FILE]$ oc get project | grep sdn
openshift-sdn   
[weliang@weliang FILE]$ cat egressrouterpod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: egress-redirect-pod
  labels:
    name: egress-redirect-pod
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router 
    imagePullPolicy:  IfNotPresent
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE
      value: 139.178.76.12
    - name: EGRESS_GATEWAY
      value: 139.178.76.1
    - name: EGRESS_DESTINATION 
      value:  172.217.7.206
    - name: EGRESS_ROUTER_MODE
      value: init
  containers:
  - name: egressrouter-redirect
    image: registry.redhat.io/openshift4/ose-egress-router
    imagePullPolicy:  IfNotPresent
[weliang@weliang FILE]$  oc create -f egressrouterpod.yaml
[weliang@weliang FILE]$ oc get pod
NAME                  READY   STATUS     RESTARTS   AGE
egress-redirect-pod   0/1     Init:0/1   0          3s
[weliang@weliang FILE]$ oc describe pod egress-redirect-pod
Name:         egress-redirect-pod
Namespace:    test
Priority:     0
Node:         ip-10-0-187-180.us-east-2.compute.internal/10.0.187.180
Start Time:   Tue, 30 Jun 2020 13:41:43 -0400
Labels:       name=egress-redirect-pod
Annotations:  openshift.io/scc: node-exporter
              pod.network.openshift.io/assign-macvlan: true
Status:       Pending
IP:           
IPs:          <none>
Init Containers:
  egress-router:
    Container ID:   
    Image:          registry.redhat.io/openshift4/ose-egress-router
    Image ID:       
    Port:           <none>
    Host Port:      <none>
    State:          Waiting
      Reason:       PodInitializing
    Ready:          False
    Restart Count:  0
    Environment:
      EGRESS_SOURCE:       139.178.76.12
      EGRESS_GATEWAY:      139.178.76.1
      EGRESS_DESTINATION:  172.217.7.206
      EGRESS_ROUTER_MODE:  init
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-m5dmv (ro)
Containers:
  egressrouter-redirect:
    Container ID:   
    Image:          registry.redhat.io/openshift4/ose-egress-router
    Image ID:       
    Port:           <none>
    Host Port:      <none>
    State:          Waiting
      Reason:       PodInitializing
    Ready:          False
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-m5dmv (ro)
Conditions:
  Type              Status
  Initialized       False 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Volumes:
  default-token-m5dmv:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-m5dmv
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason                  Age   From                                                 Message
  ----     ------                  ----  ----                                                 -------
  Normal   Scheduled               11s   default-scheduler                                    Successfully assigned test/egress-redirect-pod to ip-10-0-187-180.us-east-2.compute.internal
  Warning  FailedCreatePodSandBox  10s   kubelet, ip-10-0-187-180.us-east-2.compute.internal  Failed to create pod sandbox: rpc error: code = Unknown desc = failed to create pod network sandbox k8s_egress-redirect-pod_test_d22d4544-18ec-43bf-95c4-70f21e5246fe_0(4d0cbd2631875f117df10c0a8501b385919b1162f40382e75b8c87b8bb3cf7ca): Multus: [test/egress-redirect-pod]: error adding container to network "openshift-sdn": delegateAdd: error invoking confAdd - "openshift-sdn": error in getting result from AddNetwork: CNI request failed with status 400: 'could not open netns "/var/run/netns/11cb808b-c141-40e9-86fe-c74643b481aa": unknown FS magic on "/var/run/netns/11cb808b-c141-40e9-86fe-c74643b481aa": 1021994
'
[weliang@weliang ~]$ oc logs -c egress-router egress-redirect-pod
Error from server (BadRequest): container "egress-router" in pod "egress-redirect-pod" is waiting to start: PodInitializing
[weliang@weliang ~]$ 


Actual results:
egress-redirect-pod   0/1     Init:0/1 

Expected results:
egress-redirect-pod   1/1     Running

Additional info:
Deploying no egressrouter pod will be fine:
[weliang@weliang tmp]$ oc create -f https://raw.githubusercontent.com/weliang1/Openshift_Networking/master/Features/Pod/blue-pod-5.yaml
pod/blue-pod-5 created
[weliang@weliang tmp]$ oc get pod
NAME                  READY   STATUS     RESTARTS   AGE
blue-pod-5            1/1     Running    0          8s
egress-redirect-pod   0/1     Init:0/1   0          99m