https://bugzilla.redhat.com/show_bug.cgi?id=2068278
--- Comment #12 from Ben Beasley code@musicinmybrain.net --- Actually, since _iris_batch_flush and all the other frames related to “../src/gallium/auxiliary” are in the iris driver rather than in Blender source, this might really be a mesa bug.
See also bug 2072025.