https://bugs.freedesktop.org/show_bug.cgi?id=91308
--- Comment #5 from Andy Furniss adf.lists@gmail.com --- (In reply to Christian König from comment #4)
(In reply to Andy Furniss from comment #3)
It seems that I can make it work reliably by setting my cpus to perf with cpufreq.
Sounds like some kind of race condition to me, e.g. something isn't properly protected and multi thread save.
That's probably pretty hard to find.
Turns out I can also provoke this with kodi if I try enough, and cpufreq perf doesn't always help mpv (but usually does).