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As much as I want the -22 to fix all problems, it does not.
However, my crashes does currently not leave a trace in the logs. Sticking to -13 keeps my workhorse running riddled of any crash or freeze problems.
The simplest way to describe what is going on is that all I/O gets stuck and that my displays get a interesting change/distortion to the background image. (I can provide screen-shots upon request)
Any advice on how to best collect useful data from crashed/frozen machine is welcome.
The issue is highly reproducible on my system under heavy load.
Example: Deploy some big software with your favorite deployment tool on LXD containers and libvirt virtual machines through MAAS, at the same time do some backups with duplicity and playback of (YouTube) video in your favorite browser (Firefox/Chrome).