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Álvaro Herrera f50c329f53
logical decoding: Correctly free speculative insertion 
The error path in ReorderBufferProcessTXN was not freeing
(reorderbuffer.c's representation of) a speculative insertion record
correctly.  In assert-enabled builds, this leads to an assertion
failure.  In production builds, I see no effect; there may be a small
transient leak, but in an improbable code path such as this, such a leak
is not of any significance.  For users running with assertions enabled,
the crash is annoying.

Fix by having ReorderBufferProcessTXN() free the speculative insert
ahead of freeing the rest of the transaction, and no longer try to
handle that insert as a separate argument to ReorderBufferResetTXN().

This code came in with commit 7259736a6e (14-era).  Backpatch all the
way back.

In branches 14-16, also backpatch the assertion that originally fails in
the problem scenario, which was added by dbed2e3662 (originally
backpatched to 17), that at the end of ReorderBufferReturnTXN() the
in-memory size of the transaction is zero.

Author: Vishal Prasanna <vishal.g@zohocorp.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Backpatch-through: 14
Discussion: https://postgr.es/m/19c7623e882.4080fd5426212.311756747309556767@zohocorp.com
2026-06-16 18:13:15 +02:00
.github ci: Improve ccache handling 2026-06-08 15:26:47 -04:00
config Update config.guess and config.sub 2026-04-09 11:26:14 +02:00
contrib Fix int32 overflow in ltree_compare() 2026-06-16 09:29:47 +03:00
doc doc: Fix "Prev" link. 2026-06-15 12:16:38 -05:00
src logical decoding: Correctly free speculative insertion 2026-06-16 18:13:15 +02:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
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configure Stamp 19beta1. 2026-06-01 16:02:13 -04:00
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COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
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README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

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/.