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Previously, the parallel apply worker used SIGINT to receive a graceful shutdown signal from the leader apply worker. However, SIGINT is also used by the LOCK_TIMEOUT handler to trigger a query-cancel interrupt. This overlap caused the parallel apply worker to miss LOCK_TIMEOUT signals, leading to incorrect behavior during lock wait/contention. This patch resolves the conflict by switching the graceful shutdown signal from SIGINT to SIGUSR2. Reported-by: Zane Duffield <duffieldzane@gmail.com> Diagnosed-by: Zhijie Hou <houzj.fnst@fujitsu.com> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 16, where it was introduced Discussion: https://postgr.es/m/CACMiCkXyC4au74kvE2g6Y=mCEF8X6r-Ne_ty4r7qWkUjRE4+oQ@mail.gmail.com
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.