b421223172
The internal queue of buffers could become corrupted in a rare edge case that failed to invalidate an entry, causing a stale buffer to be "forwarded" to StartReadBuffers(). This is a simple fix for the immediate problem. A small API change might be able to remove this and related fragility entirely, but that will have to wait a bit. Defect in commit ed0b87ca. Bug: 19006 Backpatch-through: 18 Reported-by: Alexander Lakhin <exclusion@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/19006-80fcaaf69000377e%40postgresql.org
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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.