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The postmaster's code path for spawning a bgworker neglected to check whether we already have the max number of live child processes. That's a bit hard to hit, since it would necessarily be a transient condition; but if we do, AssignPostmasterChildSlot() fails causing a postmaster crash, as seen in a report from Bhargav Kamineni. To fix, invoke canAcceptConnections() in the bgworker code path, as we do in the other code paths that spawn children. Since we don't want the same pmState tests in this case, add a child-process-type parameter to canAcceptConnections() so that it can know what to do. Back-patch to 9.5. In principle the same hazard exists in 9.4, but the code is enough different that this patch wouldn't quite fix it there. Given the tiny usage of bgworkers in that branch it doesn't seem worth creating a variant patch for it. Discussion: https://postgr.es/m/18733.1570382257@sss.pgh.pa.us
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.