SELinux is preventing /usr/bin/systemd-tmpfiles from getattr access on the directory /var/tmp/kdecache-root.

[Kevin Kofler]

Garry T. Williams wrote:
> Finally, I actually read the message and wondered why I would ever have
> such a directory.  I would never attempt to start KDE as the root user.  I
> knew I didn't do that.

Running anything using the kdelibs as root may create some or all of those 
directories, this includes:
* KDM (maybe)
* anything run through kdesu (even internally)
* anything run through KAuth internally

KDE is not just the full workspace.

        Kevin Kofler