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We failed to ever fill the sixth line (LISTEN_ADDR), which caused the attempt to fill the seventh line (SHMEM_KEY) to fail, so that the shared memory key never got added to the file in standalone mode. This has been broken since we added more content to our lock files in 9.1. To fix, tweak the logic in CreateLockFile to add an empty LISTEN_ADDR line in standalone mode. This is a tad grotty, but since that function already knows almost everything there is to know about the contents of lock files, it doesn't seem that it's any better to hack it elsewhere. It's not clear how significant this bug really is, since a standalone backend should never have any children and thus it seems not critical to be able to check the nattch count of the shmem segment externally. But I'm going to back-patch the fix anyway. This problem had escaped notice because of an ancient (and in hindsight pretty dubious) decision to suppress LOG-level messages by default in standalone mode; so that the elog(LOG) complaint in AddToDataDirLockFile that should have warned of the problem didn't do anything. Fixing that is material for a separate patch though.
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/.