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64bit xids can't represent xids before epoch 0 (see also be504a3e974). When FullTransactionIdFromXidAndCtx() was passed such an xid, it'd create a 64bit xid far into the future. Noticed while adding assertions in the course of investigating be504a3e974, as amcheck's test create such xids. To fix the issue, just return FirstNormalFullTransactionId in this case. A freshly initdb'd cluster already has a newer horizon. The most minimal version of this would make the messages for some detected corruptions differently inaccurate. To make those cases accurate, switch FullTransactionIdFromXidAndCtx() to use the 32bit modulo difference between xid and nextxid to compute the 64bit xid, yielding sensible "in the future" / "in the past" answers. Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com> Discussion: https://postgr.es/m/20230108002923.cyoser3ttmt63bfn@awork3.anarazel.de Backpatch: 14-, where heapam verification was introduced
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/.