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Michael Paquier d9b49e5b4f Fix second race with timeline selection during promotion 
read_local_xlog_page_guts has the same race as logical_read_xlog_page:
RecoveryInProgress() can return true during promotion, impacting the
availability of the operations doing WAL page reads with this callback.

This problem is similar to eb4e7224a1 that has addressed the issue for
logical replication, impacting more areas of the code where this WAL
page callback can be used (same narrow window during promotion, same
availability issue):
- pg_walinspect.
- Slot advance (SQL function).
- Slot creation.

Repack workers (v19~) and 2PC files (since forever) can also use this
callback, but they are irrelevant as far as I know.  A test is added
with the SQL lookup functions.  This part relies on injection points,
and is backpatched down to v18, like the test added for eb4e7224a1.

This issue could probably be fixed as well in v14 and v15 for
pg_walinspect.  However, I also feel that there is a conservative
argument about consistency here due to the support of logical decoding
on standbys, so let's limit ourselves to v16 for now.  pg_walinspect is
used less in the field compared to the two other operations, making
addressing this problem less attractive in these two older branches.

Reported-by: Xuneng Zhou <xunengzhou@gmail.com>
Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Discussion: https://postgr.es/m/7daef094-abf3-4672-bc23-3df4763b16a3%40gmail.com
Backpatch-through: 16
2026-06-12 11:44:19 +09:00
config Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
contrib seg: Fix seg_out() to preserve the upper boundary's certainty indicator 2026-06-11 12:34:37 +03:00
doc doc: fix reference for finding replication slots to drop 2026-06-12 11:10:16 +09:00
src Fix second race with timeline selection during promotion 2026-06-12 11:44:19 +09:00
.abi-compliance-history Placate ABI checker. 2026-02-07 11:50:35 +13:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:03:27 -04:00
.cirrus.tasks.yml Make stack depth check work with asan's use-after-return 2026-05-28 11:34:13 -04:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:33:50 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2025-10-21 10:02:19 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:31:52 +02:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Stamp 16.14. 2026-05-11 15:48:18 -04:00
configure.ac Stamp 16.14. 2026-05-11 15:48:18 -04:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Integrate pg_bsd_indent into our build/test infrastructure. 2023-02-12 12:22:21 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
meson.build Stamp 16.14. 2026-05-11 15:48:18 -04:00
meson_options.txt meson: Attach colon to keyword argument 2023-06-29 12:53:41 +02:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

README 

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/.