``` Reason: attribute error: epcc-reframe/tests/synth/benchio/benchio_mpiio_ucx.py:40: 'BenchioMPIIOUCXBase' object has no attribute 'write_dir_prefix' self.env_vars["WRITE_DIR"] = os.path.join(self.write_dir_prefix, os.environ["USER"], stagedir_name) ```
