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To avoid deadlock, backend acquires a lock on heap pages in block number order. In certain cases, lock on heap pages is dropped and reacquired. In this case, the locks are dropped for reading in corresponding VM page/s. The issue is we re-acquire locks in bufferId order whereas the intention was to acquire in blockid order. This commit ensures that we will always acquire locks on heap pages in blockid order. Reported-by: Nishant Fnu Author: Nishant Fnu Reviewed-by: Amit Kapila and Robert Haas Backpatch-through: 9.4 Discussion: https://postgr.es/m/5883C831-2ED1-47C8-BFAC-2D5BAE5A8CAE@amazon.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/.