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Commit fad153ec45299bd4d4f29dec8d9e04e2f1c08148 modified sinval.c to reduce the number of calls into sinvaladt.c (which require taking a shared lock) by keeping a local buffer of collected-but-not-yet-processed messages. However, if processing of the last message in a batch resulted in a recursive call to ReceiveSharedInvalidMessages, we could overwrite that message with a new one while the outer invalidation function was still working on it. This would be likely to lead to invalidation of the wrong cache entry, allowing subsequent processing to use stale cache data. The fix is just to make a local copy of each message while we're processing it. Spotted by Andres Freund. Back-patch to 8.4 where the bug 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: 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. 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/.