OpenShift 4 upgrade stuck with Machine Config Operator degraded

Solution In Progress - Updated -

Issue

  • OpenShift 4.12 upgrade stuck with the Machine Config Operator (MCO) degraded due to mismatched osImageURL target.
  • The common workaround from KCS Solution 5598401 is not helping, and we have lost SSH access to the node after attempting to force the config.
  • When trying to log in as core user with password, the core home directory was missing which was preventing a switch to root user.

Environment

Red Hat OpenShift Container Platform 4.12
Cluster nodes with large XFS filesystems (>2-3TB)
Clusters with extensions (i.e. layered packages, kernel-rt) in use

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