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Slot creation did not clear all fields upon creation. After start the memory is zeroed, but when a physical replication slot was created in the shared memory of a previously existing logical slot, catalog_xmin would not be cleared. That in turn would prevent vacuum from doing its duties. To fix initialize all the fields. To make similar future bugs less likely, zero all of ReplicationSlotPersistentData, and re-order the rest of the initialization to be in struct member order. Analysis: Andrew Gierth Reported-By: md@chewy.com Author: Michael Paquier Discussion: <20160705173502.1398.70934@wrigleys.postgresql.org> Backpatch: 9.4, where replication slots were introduced |
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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/.