a1b74b7279
Inc75ebc657fI (Andres) introduced UnlockBufHdrExt() which can set and clear bits in the buffer state using CAS. Unfortunately I added bits before subtracting them, which means that a bit that was both removed and set would remain unset. Fix the order of operations. The only known case where that is a problem is that BM_IO_ERROR would not actually remain set. It's unfortunately not trivial to add a decent, race-free, test to verify that BM_IO_ERROR remains set. That's therefore left for the 20 cycle. Reported-by: Yura Sokolov <y.sokolov@postgrespro.ru> Discussion: https://postgr.es/m/ab0dcc9e-aba0-44e3-ac23-8d74c48888e6@postgrespro.ru Backpatch-through: 19, wherec75ebc657fwent in
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.