Services with "ProtectSystem" parameter enabled fail to start due to having an Amazon EFS mount point hosting a mount point of any filesystem underneth

Solution Unverified - Updated -

Issue

  • The postfix service is unable to start when the system has a CIFS filesystem mounted on the subdirectory of a Amazon EFS mount point.
  • The systemd-hostnamed service is unable to start when the system has a XFS filesystem mounted on the subdirectory of a Amazon EFS mount point.

Environment

  • Red Hat Enterprise Linux 8
  • Amazon EFS mounted

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