"Function not implemented" errors when trying to use `unshare` syscall in Openshift 4.11 or greater

Solution Verified - Updated -

Issue

  • Operations in pods that previously succeeded in 4.10.x may now fail in 4.11
  • Some possible symptoms may look like:
sh-5.1$ unshare
unshare: unshare failed: Function not implemented

or

sh-5.1$ podman create ubi8 ls
ERRO[0009] While applying layer: ApplyLayer exit status 1 stdout:  stderr: Error creating mount namespace before pivot: function not implemented

Environment

OpenShift Container Platform 4.11.0 and greater

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