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Michael Paquier cd312adc56 Prevent inconsistent use of stats entry for replication slots 
Concurrent activity around replication slot creation and drop could
cause a replication slot to use a stats entry it should not have used
when created, triggering an assertion failure when retrieving an
inconsistent entry from the dshash table used by the stats facility.

The issue is that pgstat_drop_replslot() calls pgstat_drop_entry()
without checking the result.  If pgstat_drop_entry() cannot free the
entry related to the object dropped, pgstat_request_entry_refs_gc()
should be called.  AtEOXact_PgStat_DroppedStats() and surrounding
routines dropping stats entries already do that.

This is documented in pgstat_internal.h, but let's add a comment at the
top of pgstat_drop_entry() as that can be easy to miss.

Reported-by: Alexander Lakhin
Author: Floris Van Nee
Analyzed-by: Andres Freund
Discussion: https://postgr.es/m/17947-b9554521ad963c9c@postgresql.org
Backpatch-through: 15
2024-06-06 08:47:40 +09:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib amcheck: Fixes for right page check during unique constraint check 2024-05-26 07:14:12 +03:00
doc Fix documentation for POSIX semaphores. 2024-06-05 15:32:47 -05:00
src Prevent inconsistent use of stats entry for replication slots 2024-06-06 08:47:40 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: windows: Use the same image for VS and MinGW tasks 2024-06-03 19:06:50 -07:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
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aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Stamp 17beta1. 2024-05-20 17:42:50 -04:00
configure.ac Stamp 17beta1. 2024-05-20 17:42:50 -04:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
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meson.build Fix meson uuid header check so it works with MSVC 2024-05-26 17:34:45 -04:00
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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/.