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Corruption of redirect item pointers often only becomes visible well after being corrupted, as e.g. bug #17255 shows: In the original reproducer, gigabyte of WAL were between the source of the corruption and the corruption becoming visible. To make it easier to find / prevent such bugs, verify whether redirect pointers are sensible at the end of heap_page_prune_execute(). 5cd7eb1f1c32 introduced related assertions while modifying the page, but they can't easily detect marking the target of an existing redirect as unused. Sometimes the corruption will be detected later, but that's harder to diagnose. Author: Andres Freund <andres@andres@anarazel.de> Reviewed-By: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/20211122175914.ayk6gg6nvdwuhrzb@alap3.anarazel.de
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/.