https://bugs.freedesktop.org/show_bug.cgi?id=91308
--- Comment #6 from Christian König deathsimple@vodafone.de --- (In reply to Andy Furniss from comment #5)
(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).
Please try the following: Start mpv with gdb, set a break point on _mesa_error and get me a backtrace where this error message is coming from.
Going to be on IRC for the next hour or so for questions.