https://bugs.freedesktop.org/show_bug.cgi?id=81644
--- Comment #94 from Grigori Goronzy greg@chown.ath.cx --- Maybe the crash actually happens because of glamor rendering - setting R600_DEBUG won't do anything in that case.
Does this patch to Mesa make any difference?
https://bugs.freedesktop.org/attachment.cgi?id=105745