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When cleaning up temporary objects during process exit the cleanup could fail with: FATAL: cannot fetch toast data without an active snapshot The bug is caused by RemoveTempRelationsCallback() not setting up a snapshot. If an object with toasted catalog data needs to be cleaned up, init_toast_snapshot() could fail with the above error. Most of the time however the the problem is masked due to cached catalog snapshots being returned by GetOldestSnapshot(). But dropping an object can cause catalog invalidations to be emitted. If no further catalog accesses are necessary between the invalidation processing and the next toast datum deletion, the bug becomes visible. It's easy to miss this bug because it typically happens after clients disconnect and the FATAL error just ends up in the log. Luckily temporary table cleanup at the next use of the same temporary schema or during DISCARD ALL does not have the same problem. Fix the bug by pushing a snapshot in RemoveTempRelationsCallback(). Also add isolation tests for temporary object cleanup, including objects with toasted catalog data. A future HEAD only commit will add more assertions. Reported-By: Miles Delahunty Author: Andres Freund Discussion: https://postgr.es/m/CAOFAq3BU5Mf2TTvu8D9n_ZOoFAeQswuzk7yziAb7xuw_qyw5gw@mail.gmail.com Backpatch: 10- |
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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/.