Takashi, yes it looks exactly the same bug as https://bugs.freedesktop.org/show_bug.cgi?id=105317. Max, I updated my Tumbleweed system a few days ago and I saw mesa was updated to 18.0.1. Since then, I have not experienced a single system freeze. It looks like the fix was successful, I am not seeing any error in my logs. I got a bit busy with work so I did not have the chance to run very long gaming sessions. If you prefer to hold on a few days before closing this bug, I can report back next Monday with more feedback.