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Add a defensive "can't happen" error to code that handles nbtree posting list splits (promote an existing assertion). This avoids a segfault in the event of an insertion of a newitem that is somehow identical to an existing non-pivot tuple in the index. An nbtree index should never have two index tuples with identical TIDs. This scenario is not particular unlikely in the event of any kind of corruption that leaves the index in an inconsistent state relative to the heap relation that is indexed. There are two known reports of preventable hard crashes. Doing nothing seems unacceptable given the general expectation that nbtree will cope reasonably well with corrupt data. Discussion: https://postgr.es/m/CAH2-Wz=Jr_d-dOYEEmwz0-ifojVNWho01eAqewfQXgKfoe114w@mail.gmail.com Backpatch: 13-, where nbtree deduplication was introduced.
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/.