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ForwardFsyncRequest() supposed that it could only be called in regular backends, which used to be true; but since the splitup of bgwriter and checkpointer, it is also called in the bgwriter. We do not want to count such calls in pg_stat_bgwriter.buffers_backend statistics, so fix things so that they aren't. (It's worth noting here that this implies an alarmingly large increase in the expected amount of cross-process fsync request traffic, which may well mean that the process splitup was not such a hot idea.)
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/.