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07 April 2024, 13:56:23 UTC
Revision 69dfc36fd54d1620209d5d40f3c68006d96b0046 authored by Tom Lane on 11 July 2021, 16:54:24 UTC, committed by Tom Lane on 11 July 2021, 16:54:24 UTC 
Lock the extension during ALTER EXTENSION ADD/DROP.
 
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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Tip revision: 69dfc36fd54d1620209d5d40f3c68006d96b0046 authored by Tom Lane on 11 July 2021, 16:54:24 UTC
Lock the extension during ALTER EXTENSION ADD/DROP.
Tip revision: 69dfc36
README 
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
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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/.
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