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f369815080
If we had not been holding buffer pin continuously since the tuple was initially fetched by the UPDATE or DELETE query, it would be possible for VACUUM or a page-prune operation to move the tuple while we're trying to copy it. This would result in a garbage "old" tuple value being passed to an AFTER ROW UPDATE or AFTER ROW DELETE trigger. The preconditions for this are somewhat improbable, and the timing constraints are very tight; so it's not so surprising that this hasn't been reported from the field, even though the bug has been there a long time. Problem found by Andres Freund. Back-patch to all active branches. |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.