bb0a3ca8d2
injection_wait() only clears its slot in the waiter array after the wait loop finishes. When the waiting query is canceled or the backend is terminated (wait look has a CHECK_FOR_INTERRUPS), the slot leaks. Later wakeups of the same point then bump the counter of the leaked slot instead of the real waiter, that sleeps forever. Repeated leaks can exhaust all the slots. The code is changed so as the waiting loop is wrapped with PG_ENSURE_ERROR_CLEANUP, so as the injection point slots, that are shared resources, can be cleaned up on ERROR as much as a FATAL. An isolation test is added: cancel one waiter, terminate another waiter, then check that a later waiter still receives a wakeup. Without the fixed code, the test would fail on timeout. Author: Zsolt Parragi <zsolt.parragi@percona.com> Discussion: https://postgr.es/m/CAN4CZFO+KF=cc0-iEg28RhqRBp_fTs6D4b8b7D7DB-pGYP3Ccg@mail.gmail.com Backpatch-through: 17
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/.