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The invalidation of an active slot is done in two steps: - Termination of the backend holding it, if any. - Report that the slot is obsolete, with a conflict cause depending on the slot's data. This can be racy because between these two steps the slot mutex would be released while doing system calls, which means that the effective_xmin and effective_catalog_xmin could advance during that time, detecting a conflict cause different than the one originally wanted before the process owning a slot is terminated. Holding the mutex longer is not an option, so this commit changes the code to record the LSNs stored in the slot during the termination of the process owning the slot. Bonus thanks to Alexander Lakhin for the various tests and the analysis. Author: Bertrand Drouvot Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/ZaTjW2Xh+TQUCOH0@ip-10-97-1-34.eu-west-3.compute.internal Backpatch-through: 16
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/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/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/.