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It was previously possible to have the launcher re-execute its main loop before shutting down if some other signal was received or an error occurred after getting SIGTERM, as reported by Qingqing Zhou. While investigating, Tom Lane further noticed that if autovacuum had been disabled in the config file, it would misbehave by trying to start a new worker instead of bailing out immediately -- it would consider itself as invoked in emergency mode. Fix both problems by checking the shutdown flag in a few more places. These problems have existed since autovacuum was introduced, so backpatch all the way back.
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/.