I finally re-installed the system.
Because of another bug
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1736017) I have to run
4.15 on this machine.
4.15.0-041500-generic #201802011154 SMP Thu Feb 1 11:55:45 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
Will report back whether this crash still occurs.
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GPU HANG since package update
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