Hi,
I found this bug on a number of our Linux workstation using Nvidia cards.
The error does not seem to be triggered by any program or operation in particular, although we run several OpenGL applications.
At the first occurrence of the error in the syslog (i.e., it would appear in dmesg) the Xorg server is in an unstable state, and all unsaved work is basically lost.
We tried switching cards (three so far), suspecting hardware issues, but the problem persisted.
The latest driver we tested was 418.74.
The state of the Nvidia drivers under Linux is in a terribly sad state, after being rather reliable for some years.
Please let us know if we can provide more feedback to speed up the solution of the problem.