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The statement start timestamp was not set before initiating the transaction that is used to look up client authentication information in pg_authid. In consequence, enable_sig_alarm computed a wrong value (far in the past) for statement_fin_time. That didn't have any immediate effect, because the timeout alarm was set without reference to statement_fin_time; but if we subsequently blocked on a lock for a short time, CheckStatementTimeout would consult the bogus value when we cancelled the lock timeout wait, and then conclude we'd timed out, leading to immediate failure of the connection attempt. Thus an innocent "vacuum full pg_authid" would cause failures of concurrent connection attempts. Noted while testing other, more serious consequences of vacuum full on system catalogs. We should set the statement timestamp before StartTransactionCommand(), so that the transaction start timestamp is also valid. I'm not sure if there are any non-cosmetic effects of it not being valid, but the xact timestamp is at least sent to the statistics machinery. Back-patch to 9.0. Before that, the client authentication timeout was done outside any transaction and did not depend on this state to be valid.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.