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at the same instant as a new backend is spawned. Since CountActiveBackends() doesn't hold ProcArrayLock, it needs to be prepared for the case that a pointer at the end of the proc array is still NULL even though numProcs says it should be valid, since it doesn't hold ProcArrayLock. Backpatch to 8.1. 8.0 and earlier had this right, but it was broken in the split of PGPROC and sinval shared memory arrays. Per report and proposal by Marko Kreen.
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/.