Why does 4.1 still not use the right defaults with UCX?
Without specifying osc=ucx, IMB-RMA crashes like 4.0.5. I haven't checked what else it is UCX says you must set for openmpi to avoid memory corruption, at least, but I guess that won't be right either. Users surely shouldn't have to explore notes for a fundamental library to be able to run even IMB.
