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In commit272248a0c, we introduced an InitialRunningXacts array to remember transactions and subtransactions that were running when the xl_running_xacts record that we decoded was written. This array was allocated in the snapshot builder memory context after we restore serialized snapshot but we forgot to reset the array while freeing the builder memory context. So, the next time when we start decoding in the same session where we don't restore any serialized snapshot, we ended up using the uninitialized array and that can lead to unpredictable behavior. This problem doesn't exist in HEAD as instead of using InitialRunningXacts, we added the list of transaction IDs and sub-transaction IDs, that have modified catalogs and are running during snapshot serialization, to the serialized snapshot (see commit7f13ac8123). Reported-by: Maxim Orlov Author: Masahiko Sawada Reviewed-by: Amit Kapila, Maxim Orlov Backpatch-through: 11 Discussion: https://postgr.es/m/CACG=ezZoz_KG+Ryh9MrU_g5e0HiVoHocEvqFF=NRrhrwKmEQJQ@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. 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/.