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Clearly it's not okay for nbtree to split a page that is the only page on its level, and then find that it has to split the parent one level up in turn. There is simply no code to handle the split_only_page case in the _bt_insertonpg() "newitem won't fit" branch (only the "newitem fits" branch handles split_only_page). Add a defensive assertion that will fail if a split_only_page call to _bt_insertonpg() somehow ends up splitting the target/parent page. I (pgeoghegan) believe that we don't need split_only_page handling for the "newitem won't fit" branch because anybody calling _bt_insertonpg() like this would have to hold a lock on the same one and only child page.
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/.