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Commitf9b7fc65fixed a race when predicate-locking completely empty btrees: without a buffer lock held, a matching key could be inserted between _bt_search and the PredicateLockRelation call, so the scan would miss concurrently inserted tuples while the writer wouldn't see the reader's predicate lock. That commit only fixed _bt_first's _bt_search path, though. Scans without useful insertion scan keys return early from _bt_first via _bt_endpoint, which still didn't recheck if the relation was empty. To fix, add handling to _bt_endpoint that is analogous to the handling added to _bt_search by commitf9b7fc65. Author: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/CAH2-WzkNoTn3yXY0iGkSuavJ+sL8EROf+kitW+_2v2tJVWuKmA@mail.gmail.com Backpatch-through: 14
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/.