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Postgres 14 commit 5b861baa taught nbtree VACUUM to tolerate buggy opclasses. VACUUM's inability to locate a to-be-deleted page's downlink in the parent page was logged instead of throwing an error. VACUUM could just press on with vacuuming the index, and vacuuming the table as a whole. There are now anecdotal reports of this error causing problems that were much more disruptive than the underlying index corruption ever could be. Anything that makes VACUUM unable to make forward progress against one table/index ultimately risks making the system enter xidStopLimit mode. There is no good reason to take any chances here, so backpatch the hardening commit. Author: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/CAH2-Wzm9HR6Pow=t-iQa57zT8qmX6_M4h14F-pTtb=xFDW5FBA@mail.gmail.com Backpatch: 10-13 (all supported versions that lacked the hardening)
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/.