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pg_resetwal didn't accept multixid 0 or multixact offset UINT32_MAX, but they are both valid values that can appear in the control file. That caused pg_upgrade to fail if you tried to upgrade a cluster exactly at multixid or offset wraparound, because pg_upgrade calls pg_resetwal to restore multixid/offset on the new cluster to the values from the old cluster. To fix, allow those values in pg_resetwal. Fixes bugs #18863 and #18865 reported by Dmitry Kovalenko. Backpatch down to v15. Version 14 has the same bug, but the patch doesn't apply cleanly there. It could be made to work but it doesn't seem worth the effort given how rare it is to hit this problem with pg_upgrade, and how few people are upgrading to v14 anymore. Author: Maxim Orlov <orlovmg@gmail.com> Discussion: https://www.postgresql.org/message-id/CACG%3DezaApSMTjd%3DM2Sfn5Ucuggd3FG8Z8Qte8Xq9k5-%2BRQis-g@mail.gmail.com Discussion: https://www.postgresql.org/message-id/18863-72f08858855344a2@postgresql.org Discussion: https://www.postgresql.org/message-id/18865-d4c66cf35c2a67af@postgresql.org Backpatch-through: 15
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.