7dc721889b
After calling XLogInitBufferForRedo(), the page might be all-zeros if it was not in page cache already. btree_xlog_unlink_page initialized the page correctly, but it called PageGetSpecialPointer before initializing it, which would lead to a corrupt page at WAL replay, if the unlinked page is not in page cache. Backpatch to 9.4, the bug came with the rewrite of B-tree page deletion.
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. 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/.