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Once we've received a shutdown signal (SIGINT or SIGTERM), we should not launch any more child processes, even if we get signals requesting such. The normal code path for spawning backends has always understood that, but the postmaster's infrastructure for hot standby and autovacuum didn't get the memo. As reported by Hari Babu in bug #7643, this could lead to failure to shut down at all in some cases, such as when SIGINT is received just before the startup process sends PMSIGNAL_RECOVERY_STARTED: we'd launch a bgwriter and checkpointer, and then those processes would have no idea that they ought to quit. Similarly, launching a new autovacuum worker would result in waiting till it finished before shutting down. Also, switch the order of the code blocks in reaper() that detect startup process crash versus shutdown termination. Once we've sent it a signal, we should not consider that exit(1) is surprising. This is just a cosmetic fix since shutdown occurs correctly anyway, but better not to log a phony complaint about startup process crash. Back-patch to 9.0. Some parts of this might be applicable before that, but given the lack of prior complaints I'm not going to worry too much about older branches. |
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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/.