For what it's worth, I don't get these messages anymore since I replaced
my CPU fan.

My graphics card has passive cooling only, and relies on air flow in the
case, so CPU and case fans. The CPU fan was dead, had probably been for
a long time. I replaced it and have not seen this issue ever since. Of
course it probably is something else, but you could try and monitor
temperature, just in case.

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https://bugs.launchpad.net/bugs/1863390

Title:
  GPU lockup ring 0 stalled for more than X msec

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