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Evidence from buildfarm member crake suggests that the new test_shm_mq module is routinely crashing the server due to the arrival of a SIGUSR1 after the shared memory segment has been unmapped. Although processes using the new dynamic background worker facilities are more likely to receive a SIGUSR1 around this time, the problem is also possible on older branches, so I'm back-patching the parts of this change that apply to older branches as far as they apply. It's already generally the case that code checks whether these pointers are NULL before deferencing them, so the important thing is mostly to make sure that they do get set to NULL before they become invalid. But in master, there's one case in procsignal_sigusr1_handler that lacks a NULL guard, so add that. Patch by me; review by Tom Lane. |
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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/.