1d27dcf578
When we create a temporary copy of the old node buffer, in stack, we mustn't leak that into any of the long-lived data structures. Before this patch, when we called gistPopItupFromNodeBuffer(), it got added to the array of "loaded buffers". After gistRelocateBuildBuffersOnSplit() exits, the pointer added to the loaded buffers array points to garbage. Often that goes unnotied, because when we go through the array of loaded buffers to unload them, buffers with a NULL pageBuffer are ignored, which can often happen by accident even if the pointer points to garbage. This patch fixes that by marking the temporary copy in stack explicitly as temporary, and refrain from adding buffers marked as temporary to the array of loaded buffers. While we're at it, initialize nodeBuffer->pageBlocknum to InvalidBlockNumber and improve comments a bit. This isn't strictly necessary, but makes debugging easier.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.