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This is a Linux kernel bug that apparently exists in every extant kernel version: sometimes shmctl() will fail with EIDRM when EINVAL is correct. We were assuming that EIDRM indicates a possible conflict with pre-existing backends, and refusing to start the postmaster when this happens. Fortunately, there does not seem to be any case where Linux can legitimately return EIDRM (it doesn't track shmem segments in a way that would allow that), so we can get away with just assuming that EIDRM means EINVAL on this platform. Per reports from Michael Fuhr and Jon Lapham --- it's a bit surprising we have not seen more reports, actually.
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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.