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impi 2021.13 seems broken, which is preventing this migration from completing, because there is not:
so the only way to test impi 2021.13 is by upgrading hdf5. The failing tests don't involve hdf5 at all, though. It's extremely basic communicator setup that appears to fail. Super weirdly, though, exercising mpi via mpi4py doesn't trigger any issue. Maybe it's the C++ interface? There is no useful debugging output that I can find.