Leapp can fail with a MountError (OverlayFS + XFS ftype=1)

Solution Verified - Updated -

Issue

Leapp preupgrade does not work, sometimes without any explanation (no python traceback).
In most cases, the below python exception is raised:

MountError: Failed to create mount target directory /var/lib/leapp/scratch/mounts/root_/system_overlay/XXX

Some specific symptoms have also been reported (see the diagnostic step).

Environment

  • Red Hat Enterprise Linux 7, 8, 9
  • In-Place Upgrades, leapp

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