Fix here: https://github.com/kubernetes/kubernetes/pull/50843

@ppospisi please create a backport for ose/enterprise-3.6.x

Please don't backport this just yet, it seems like it breaks existing flexvolume plugins and I'm chasing it down still :/ https://github.com/kubernetes/kubernetes/pull/50843#issuecomment-324984866 . In other words, backporting may provide a workaround for flexvolumes which were broken by 1.7 but may come at the cost of breaking everybody else

assigning to Matthew while he investigates.

ping me before you backport to 3.6, it may not be required after all.

https://github.com/openshift/origin/pull/16174

Verified on v3.7.0-0.127.0 using an nfs flexvolume. 

While this Pod was starting,  an error was reported in the event: {"message":"SELinux relabeling of /var/lib/origin/openshift.local.volumes/pods/e40ab00d-a34b-11e7-84f8-0050569f68e7/volumes/openshift.com~nfs/test is not allowed: \"operation not supported\""}

Pod:
apiVersion: v1
kind: Pod
metadata:
  name: nginx-nfs
  namespace: default
spec:
  containers:
  - name: nginx-nfs
    image: nginx
    volumeMounts:
    - name: test
      mountPath: /data
    ports:
    - containerPort: 80
  volumes:
  - name: test
    flexVolume:
      driver: "openshift.com/nfs"
      fsType: "nfs"
      options:
        server: "xxxx"
        share: "nfs"

flexvolume: https://raw.githubusercontent.com/kubernetes/kubernetes/master/examples/volumes/flexvolume/nfs


# oc describe pod nginx-nfs                                                                                                                                     
Name:           nginx-nfs
Namespace:      default
Node:           ocp37.lb.master1.vsphere.local/10.66.146.33
Start Time:     Wed, 27 Sep 2017 02:20:00 -0400
Labels:         <none>
Annotations:    openshift.io/scc=privileged
Status:         Running
IP:             10.128.2.3
Containers:
  nginx-nfs:
    Container ID:       docker://027ee8a4ec9ab63673473a7db8066e2a335684dd759ba10eef78771d07d06c2b
    Image:              nginx
    Image ID:           docker-pullable://docker.io/nginx@sha256:aa1c5b5f864508ef5ad472c45c8d3b6ba34e5c0fb34aaea24acf4b0cee33187e
    Port:               80/TCP
    State:              Waiting
      Reason:           CrashLoopBackOff
    Last State:         Terminated
      Reason:           ContainerCannotRun
      Message:          SELinux relabeling of /var/lib/origin/openshift.local.volumes/pods/e40ab00d-a34b-11e7-84f8-0050569f68e7/volumes/openshift.com~nfs/test is not allowed: "operation not supported"
      Exit Code:        128
      Started:          Wed, 27 Sep 2017 02:24:28 -0400
      Finished:         Wed, 27 Sep 2017 02:24:28 -0400
    Ready:              False
    Restart Count:      5
    Environment:        <none>
    Mounts:
      /data from test (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-zxmv7 (ro)
Conditions:
  Type          Status
  Initialized   True 
  Ready         False 
  PodScheduled  True 
Volumes:
  test:
  <unknown>
  default-token-zxmv7:
    Type:       Secret (a volume populated by a Secret)
    SecretName: default-token-zxmv7
    Optional:   false
QoS Class:      BestEffort
Node-Selectors: <none>
Tolerations:    <none>
Events:
  FirstSeen     LastSeen        Count   From                                    SubObjectPath                   Type            Reason                  Message
  ---------     --------        -----   ----                                    -------------                   --------        ------                  -------
  6m            6m              1       default-scheduler                                                       Normal          Scheduled               Successfully assigned nginx-nfs to ocp37.lb.master1.vsphere.local
  6m            6m              1       kubelet, ocp37.lb.master1.vsphere.local                                 Normal          SuccessfulMountVolume   MountVolume.SetUp succeeded for volume "default-token-zxmv7" 
  6m            6m              1       kubelet, ocp37.lb.master1.vsphere.local                                 Normal          SuccessfulMountVolume   MountVolume.SetUp succeeded for volume "test" 
  5m            5m              3       kubelet, ocp37.lb.master1.vsphere.local spec.containers{nginx-nfs}      Normal          Created                 Created container
  5m            5m              3       kubelet, ocp37.lb.master1.vsphere.local spec.containers{nginx-nfs}      Warning         Failed                  Error: failed to start container "nginx-nfs": Error response from daemon: {"message":"SELinux relabeling of /var/lib/origin/openshift.local.volumes/pods/e40ab00d-a34b-11e7-84f8-0050569f68e7/volumes/openshift.com~nfs/test is not allowed: \"operation not supported\""}
  5m            4m              3       kubelet, ocp37.lb.master1.vsphere.local spec.containers{nginx-nfs}      Warning         BackOff                 Back-off restarting failed container
  6m            4m              4       kubelet, ocp37.lb.master1.vsphere.local spec.containers{nginx-nfs}      Normal          Pulling                 pulling image "nginx"
  5m            4m              4       kubelet, ocp37.lb.master1.vsphere.local spec.containers{nginx-nfs}      Normal          Pulled                  Successfully pulled image "nginx"
  5m            1m              22      kubelet, ocp37.lb.master1.vsphere.local                                 Warning         FailedSync              Error syncing pod

Then update the flexvolume and add capability `selinuxRelabel:false`, eg: '{"status": "Success", "capabilities": {"attach": false, "selinuxRelabel": false}}'

Restart atomic services and create new pod using this flex volume , it could run again.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:3188