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When deleting pages the nbtree code has to walk through siblings of a tree node. When those sibling links are corrupted that can lead to endless loops - which are currently not interruptible. This is especially problematic if autovacuum is repeatedly blocked on such indexes, as it can be hard to get out of that situation without resorting to single user mode. Thus add interrupt checks to appropriate places in such loops. Unfortunately in one of the cases it's it's not easy to do so. Between 9.3 and 9.4 the page deletion (and page split) code changed significantly. Before it was significantly less robust against interruptions. Therefore don't backpatch to 9.3. Author: Andres Freund Discussion: https://postgr.es/m/20180627191629.wkunw2qbibnvlz53@alap3.anarazel.de Backpatch: 9.4-
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.