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Non-zero vacuum_defer_cleanup_age values cause pg_upgrade freezing of the system catalogs to be incomplete, or do nothing. This will cause the upgrade to fail in confusing ways. Reported-by: Laurenz Albe Discussion: https://postgr.es/m/7d6f6c22ba05ce0c526e9e8b7bfa8105e7da45e6.camel@cybertec.at Backpatch-through: 9.5