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Although we were careful to lock the object being added or dropped, we failed to get any sort of lock on the extension itself. This allowed the ALTER to proceed in parallel with a DROP EXTENSION, which is problematic for a couple of reasons. If both commands succeeded we'd be left with a dangling link in pg_depend, which would cause problems later. Also, if the ALTER failed for some reason, it might try to print the extension's name, and that could result in a crash or (in older branches) a silly error message complaining about extension "(null)". Per bug #17098 from Alexander Lakhin. Back-patch to all supported branches. Discussion: https://postgr.es/m/17098-b960f3616c861f83@postgresql.org |
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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: 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/.