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The ExecutorEnd hook is invoked in a context that could be quite long-lived, not the executor's own per-query context as I think we were sort of assuming. Thus, any cruft generated while producing the EXPLAIN output could accumulate over multiple queries. This can result in spectacular leakage if log_nested_statements is on, and even without that I'm surprised nobody complained before. To fix, just switch into the executor's context so that anything we allocate will be released when standard_ExecutorEnd frees the executor state. We might as well nuke the code's retail pfree of the explain output string, too; that's laughably inadequate to the need. Japin Li, per report from Jeff Janes. This bug is old, so back-patch to all supported branches. Discussion: https://postgr.es/m/CAMkU=1wCVtbeRn0s9gt12KwQ7PLXovbpM8eg25SYocKW3BT4hg@mail.gmail.com |
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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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.