Bug 1956480

Verified on 4.8.0-0.nightly-2021-05-21-200728 that it is using the new boot image.

$ oc get clusterversion
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.8.0-0.nightly-2021-05-21-200728   True        False         31m     Cluster version is 4.8.0-0.nightly-2021-05-21-200728
$ oc -n openshift-machine-api get machinesets
NAME                                 DESIRED   CURRENT   READY   AVAILABLE   AGE
ci-ln-d7rw6f2-f76d1-9wg8c-worker-b   1         1         1       1           52m
ci-ln-d7rw6f2-f76d1-9wg8c-worker-c   1         1         1       1           52m
ci-ln-d7rw6f2-f76d1-9wg8c-worker-d   1         1         1       1           52m
$ oc -n openshift-machine-api get machinesets/ci-ln-d7rw6f2-f76d1-9wg8c-worker-b -o yaml
apiVersion: machine.openshift.io/v1beta1
kind: MachineSet
metadata:
  annotations:
    machine.openshift.io/memoryMb: "15360"
    machine.openshift.io/vCPU: "4"
  creationTimestamp: "2021-05-24T12:23:47Z"
  generation: 1
  labels:
    machine.openshift.io/cluster-api-cluster: ci-ln-d7rw6f2-f76d1-9wg8c
  managedFields:
  - apiVersion: machine.openshift.io/v1beta1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:labels:
          .: {}
          f:machine.openshift.io/cluster-api-cluster: {}
      f:spec:
        .: {}
        f:replicas: {}
        f:selector:
          .: {}
          f:matchLabels:
            .: {}
            f:machine.openshift.io/cluster-api-cluster: {}
            f:machine.openshift.io/cluster-api-machineset: {}
        f:template:
          .: {}
          f:metadata:
            .: {}
            f:labels:
              .: {}
              f:machine.openshift.io/cluster-api-cluster: {}
              f:machine.openshift.io/cluster-api-machine-role: {}
              f:machine.openshift.io/cluster-api-machine-type: {}
              f:machine.openshift.io/cluster-api-machineset: {}
          f:spec:
            .: {}
            f:metadata: {}
            f:providerSpec:
              .: {}
              f:value:
                .: {}
                f:apiVersion: {}
                f:canIPForward: {}
                f:credentialsSecret: {}
                f:deletionProtection: {}
                f:disks: {}
                f:kind: {}
                f:machineType: {}
                f:metadata: {}
                f:networkInterfaces: {}
                f:projectID: {}
                f:region: {}
                f:serviceAccounts: {}
                f:tags: {}
                f:userDataSecret: {}
                f:zone: {}
      f:status:
        .: {}
        f:fullyLabeledReplicas: {}
        f:observedGeneration: {}
        f:replicas: {}
    manager: cluster-bootstrap
    operation: Update
    time: "2021-05-24T12:23:47Z"
  - apiVersion: machine.openshift.io/v1beta1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .: {}
          f:machine.openshift.io/memoryMb: {}
          f:machine.openshift.io/vCPU: {}
    manager: machine-controller-manager
    operation: Update
    time: "2021-05-24T12:29:01Z"
  - apiVersion: machine.openshift.io/v1beta1
    fieldsType: FieldsV1
    fieldsV1:
      f:status:
        f:availableReplicas: {}
        f:fullyLabeledReplicas: {}
        f:observedGeneration: {}
        f:readyReplicas: {}
        f:replicas: {}
    manager: machineset-controller
    operation: Update
    time: "2021-05-24T12:35:38Z"
  name: ci-ln-d7rw6f2-f76d1-9wg8c-worker-b
  namespace: openshift-machine-api
  resourceVersion: "21920"
  uid: b7753388-0d69-42a5-b76f-3587743f57c6
spec:
  replicas: 1
  selector:
    matchLabels:
      machine.openshift.io/cluster-api-cluster: ci-ln-d7rw6f2-f76d1-9wg8c
      machine.openshift.io/cluster-api-machineset: ci-ln-d7rw6f2-f76d1-9wg8c-worker-b
  template:
    metadata:
      labels:
        machine.openshift.io/cluster-api-cluster: ci-ln-d7rw6f2-f76d1-9wg8c
        machine.openshift.io/cluster-api-machine-role: worker
        machine.openshift.io/cluster-api-machine-type: worker
        machine.openshift.io/cluster-api-machineset: ci-ln-d7rw6f2-f76d1-9wg8c-worker-b
    spec:
      metadata: {}
      providerSpec:
        value:
          apiVersion: gcpprovider.openshift.io/v1beta1
          canIPForward: false
          credentialsSecret:
            name: gcp-cloud-credentials
          deletionProtection: false
          disks:
          - autoDelete: true
            boot: true
            image: projects/rhcos-cloud/global/images/rhcos-48-84-202105190318-0-gcp-x86-64
            labels: null
            sizeGb: 128
            type: pd-ssd
          kind: GCPMachineProviderSpec
          machineType: n1-standard-4
          metadata:
            creationTimestamp: null
          networkInterfaces:
          - network: ci-ln-d7rw6f2-f76d1-9wg8c-network
            subnetwork: ci-ln-d7rw6f2-f76d1-9wg8c-worker-subnet
          projectID: openshift-gce-devel-ci
          region: us-east1
          serviceAccounts:
          - email: ci-ln-d7rw6f2-f76d1-9wg8c-w.gserviceaccount.com
            scopes:
            - https://www.googleapis.com/auth/cloud-platform
          tags:
          - ci-ln-d7rw6f2-f76d1-9wg8c-worker
          userDataSecret:
            name: worker-user-data
          zone: us-east1-b
status:
  availableReplicas: 1
  fullyLabeledReplicas: 1
  observedGeneration: 1
  readyReplicas: 1
  replicas: 1
$ oc -n openshift-machine-api get machinesets/ci-ln-d7rw6f2-f76d1-9wg8c-worker-b -o yaml | grep image:
            image: projects/rhcos-cloud/global/images/rhcos-48-84-202105190318-0-gcp-x86-64

$ https://github.com/openshift/installer/pull/4942/files

Verified per #2

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 (Moderate: OpenShift Container Platform 4.8.2 bug fix and security update), 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-2021:2438