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Commit 0d861bbb, which added deduplication to nbtree, had _bt_check_unique() pass a TID to table_index_fetch_tuple_check() that isn't safe to mutate. table_index_fetch_tuple_check()'s tid argument is modified when the TID in question is not the latest visible tuple in a hot chain, though this wasn't documented. To fix, go back to using a local copy of the TID in _bt_check_unique(), and update comments above table_index_fetch_tuple_check(). Backpatch: 13-, where B-Tree deduplication 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/.