(In reply to Pierre-Eric Pelloux-Prayer from comment #28)
> 
> Could you test this commit
> https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2016/
> diffs?commit_id=4829f697ab2ceb2fc2772cc1220acc4185e6013d and let us know if
> it fixes this issue?

Using kernel 5.3.0 and mesa git with that patch:
* Graphics corruption in Dolphin is gone (without nodcc env variable)
* System lockup is gone (without nodcc env variable)
* Desktop corruption is still present (without nodcc env variable)
* Desktop corruption is gone (nodcc env variable set)