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Previously, we encoded both NULL and the first byte at the base address as 0. That confusion led to the assertion in commit e07d4ddc, which failed when min_dynamic_shared_memory was used. Give them distinct encodings, by switching to 1-based offsets for non-NULL pointers. Also improve macro hygiene in passing (missing/misplaced parentheses), and remove open-coded access to the raw offset value from freepage.c/h. Although e07d4ddc was back-patched to 10, the only code that actually makes use of relptr at the base address arrived in 84b1c63a, so no need to back-patch further than 14 for now. Reported-by: Justin Pryzby <pryzby@telsasoft.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/20220519193839.GT19626%40telsasoft.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/.