Comment 6 for bug 2051838

To avoid having disk full problems, I used the following workaround:

I created a file /etc/rsyslog.d/10-no-gdm-wayland.conf

Containing the following lines:
:msg, contains, "Error: WaylandMessage::Write() too many files to send" ~
:msg, contains, " :" ~

And then restarted rsyslog (as root): systemctl restart rsyslog.service