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By calling wipe_mem() on per-buffer data memory that has been released, we are also telling Valgrind that the memory is "noaccess". We need to set it to "undefined" before giving it to the registered callback to fill in, when a slot is reused. As discovered by build farm animal skink when the VACUUM streamification patches landed (the first users of per-buffer data). Pushing to master only for now, to clear the error on skink. It's also possible that external code might discover the per-buffer data feature in v17, and reasonable to expect Valgrind not to produce spurious memcheck reports, but the back-patch is deferred until after the imminent minor release is out of the way. Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Tested-by: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/CA%2BhUKG%2Bg6aXpi2FEHqeLOzE%2BxYw%3DOV%2B-N5jhOEnnV%2BF0USM9xA%40mail.gmail.com
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/.