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Commit 6f38d4dac38 failed to heed a warning about the stability of the value pointed to by "otid". The caller is allowed to pass in a pointer to newtup->t_self, which will be updated during the execution of the function. Instead, the SSI check should use the value we copy into oldtup.t_self near the top of the function. Not a live bug, because newtup->t_self doesn't really get updated until a bit later, but it was confusing and broke the rule established by the comment. Back-patch to 13. Reported-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/2689164.1618160085%40sss.pgh.pa.us
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/.