d73d14c271
Commit c9b0cbe98bd783e24a8c4d8d8ac472a494b81292 accidentally broke the order of operations during postmaster shutdown: it resulted in removing the per-socket lockfiles after, not before, postmaster.pid. This creates a race-condition hazard for a new postmaster that's started immediately after observing that postmaster.pid has disappeared; if it sees the socket lockfile still present, it will quite properly refuse to start. This error appears to be the explanation for at least some of the intermittent buildfarm failures we've seen in the pg_upgrade test. Another problem, which has been there all along, is that the postmaster has never bothered to close() its listen sockets, but has just allowed them to close at process death. This creates a different race condition for an incoming postmaster: it might be unable to bind to the desired listen address because the old postmaster is still incumbent. This might explain some odd failures we've seen in the past, too. (Note: this is not related to the fact that individual backends don't close their client communication sockets. That behavior is intentional and is not changed by this patch.) Fix by adding an on_proc_exit function that closes the postmaster's ports explicitly, and (in 9.3 and up) reshuffling the responsibility for where to unlink the Unix socket files. Lock file unlinking can stay where it is, but teach it to unlink the lock files in reverse order of creation.
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. 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/.