Comment # 3 on bug 107001 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.