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We allegedly allocated all remaining memory for the read buffers of the sort tapes, but we allocated the merge heap only after that. That means that the allocation of the merge heap was guaranteed to go over the memory limit. Fix by allocating the merge heap first. This makes little difference in practice, because the merge heap is tiny, but let's tidy. While we're at it, add a safeguard for the case that we are already over the limit when allocating the read buffers. That shouldn't happen, but better safe than sorry. The memory accounting error was reported off-list by Peter Geoghegan.
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/.