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This would only have any effect if the old root page needed to have a full-page image made (ie, this was the first mod to it since a checkpoint), *and* if the byte left uninitialized chanced to contain zero. In that case the WAL code would fail to remove the "hole" from the full-page image, which would bloat the WAL log a bit but not have any effect worse than that. Found by buildfarm member skink, whose valgrind run noticed the use of an uninitialized value. Apparently timing in the regression tests is such that the triggering condition is rare, or valgrind testing would have seen this before. Oversight in commit 40dae7ec537c5619fc93ad602c62f37be786d161. This bug affects only the 9.4 branch, since in later branches refactoring of the WAL-log-creation APIs fixed it. Report: <20160521203101.jp5yxquhhkabvo56@alap3.anarazel.de>
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/.