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Normally nel == 0 works okay because the initial value of "last" will be less than "base"; but if "base" is zero then the calculation wraps around and we have a very large (unsigned) value for "last", so that the loop can be entered and we get a SIGSEGV on a bogus pointer. This is certainly the proximate cause of the recent reports of Windows builds crashing on 'infinity'::timestamp --- evidently, they're either not setting an active timezonetktbl, or setting an empty one. It's not yet clear to me why it's only happening on Windows and not happening on any buildfarm member. But even if that's due to some bug elsewhere, it seems wise for this function to not choke on the powerup values of timezonetktbl/sztimezonetktbl. I also changed the copy of this code in ecpglib, although I am not sure whether it's exposed to a similar hazard. Per report and stack trace from Richard Broersma.
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/.