https://bugs.freedesktop.org/show_bug.cgi?id=107001

--- Comment #3 from claude@mathr.co.uk --- So, I got some freezes with Linux 4.18.5 and Mesa 18.0.5 (the version of Mesa that I assumed was bug free), and so far (24 hours uptime) no freezes with Linux 4.18.7 and Mesa 18.1.7-1. The Linux change log mentions some fixes for various deadlocks, perhaps I was just unlucky that some Mesa versions were more likely than others to trigger these Linux bugs on my system. I'll leave this open for another week or so of testing.