500b61769f
10f66468475 intended to limit the value of io_combine_limit to the minimum of io_combine_limit and io_max_combine_limit. To avoid issues with interdependent GUCs, it introduced io_combine_limit_guc and set io_combine_limit in assign hooks. That plan was thwarted by guc_tables.c accidentally still referencing io_combine_limit, instead of io_combine_limit_guc. That lead to the GUC machinery overriding the work done in the assign hooks, potentially leaving io_combine_limit with a too high value. The consequence of this bug was that when running with io_combine_limit > io_combine_limit_guc the AIO machinery would not have reserved large enough iovec and IO data arrays, with one IO's arrays overlapping with another IO's, leading to total confusion. To make such a problem easier to detect in the future, add assertions to pgaio_io_set_handle_data_* checking the length is smaller than io_max_combine_limit (not just PG_IOV_MAX). It'd be nice to have a few tests for this, but it's not entirely obvious how to do so portably. As remarked upon by Tom, the GUC assignment hooks really shouldn't set the underlying variable, that's the job of the GUC machinery. Change that as well. Discussion: https://postgr.es/m/c5jyqnuwrpigd35qe7xdypxsisdjrdba5iw63mhcse4mzjogxo@qdjpv22z763f
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.