https://bugs.freedesktop.org/show_bug.cgi?id=100465
--- Comment #26 from Zachary Michaels zmichaels@oblong.com --- Also note that forcing VGT_STREAMOUT_SYNC, VGT_STREAMOUT_RESET, or VGT_FLUSH to be emitted on each call to si_draw_vbo (via si_emit_cache_flush) also appears to work around the issue, though this has not been as thoroughly tested.