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The TransactionIdInRecentPast() should return false for all the transactions older than TransamVariables->oldestClogXid. However, the function contains a bug in comparison FullTransactionId to TransactionID allowing full transactions between nextXid - 2^32 and oldestClogXid - 2^31. This commit fixes TransactionIdInRecentPast() by turning the oldestClogXid into FullTransactionId first, then performing the comparison. Backpatch to all supported versions. Reported-by: Egor Chindyaskin Bug: 18212 Discussion: https://postgr.es/m/18212-547307f8adf57262%40postgresql.org Author: Karina Litskevich Reviewed-by: Kyotaro Horiguchi Backpatch-through: 12
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/.