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It's possible for the query that "waits for restart" to complete a successful iteration before the postmaster has noticed its SIGKILL'd child and begun the restart cycle. (This is a bit hard to believe perhaps, but it's been seen at least twice in the buildfarm, mainly on ancient platforms that likely have quirky schedulers.) To provide a more secure interlock, wait for the other session we're using to report that it's been forcibly shut down. Patch by me, based on a suggestion from Andres Freund. Back-patch to v14 where this test case came in. Discussion: https://postgr.es/m/1801850.1649047827@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/.