Created attachment 817376 [details]
yast log

umount_finish
(https://github.com/yast/yast-installation/blob/master/src/lib/installation/clients/umount_finish.rb)

unmounts the filesystems that have been mounted to the target system during
the installation (i.e. everything below /mnt).

It does so *twice*.

As it usually succeeds in the first iteration, the second iteration mostly
fails.

And as there's quite some fallback stuff programmed in (like lazy unmounting
and
ro-remounting) this leads to quite a mess in the logs and some unneeded
activities.

See attached log fragment for an example.