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GSS-related resources should be cleaned up in pqDropConnection, not freePGconn, else the wrong things happen when resetting a connection or trying to switch to a different server. It's also critical to reset conn->gssenc there. During connection setup, initialize conn->try_gss at the correct place, else switching to a different server won't work right. Remove now-redundant cleanup of GSS resources around one (and, for some reason, only one) pqDropConnection call in connectDBStart. Per report from Kyotaro Horiguchi that psql would freeze up, rather than successfully resetting a GSS-encrypted connection after a server restart. This is YA oversight in commit b0b39f72b, so back-patch to v12. Discussion: https://postgr.es/m/20200710.173803.435804731896516388.horikyota.ntt@gmail.com
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/.