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When RETURNING is specified, ExecDelete would return a virtual-tuple slot that could contain pointers into an already-unpinned disk buffer. Another process could change the buffer contents before we get around to using the data, resulting in garbage results or even a crash. This seems of fairly low probability, which may explain why there are no known field reports of the problem, but it's definitely possible. Fix by forcing the result slot to be "materialized" before we release pin on the disk buffer. Back-patch to 9.0; in earlier branches there is no bug because ExecProcessReturning sent the tuple to the destination immediately. Also, this is already fixed in HEAD as part of the writable-foreign-tables patch (where the fix is necessary for DELETE RETURNING to work at all with postgres_fdw).
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/.