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Amit Kapila bdae2c20e8 Avoid stale slot access after dropping obsolete synced slots.
drop_local_obsolete_slots() continued to dereference local_slot after
calling ReplicationSlotDropAcquired().  Once the slot is dropped, its
entry in the slot array can be reused by another backend, so later reads
of local_slot->data could observe a different slot's name or database
OID, leading to an incorrect unlock and log message.

Save the slot name and database OID before performing the drop, and use
the saved values for the subsequent UnlockSharedObject() call and the log
message.  While at it, emit the "dropped replication slot" message only
when a slot was actually dropped, rather than unconditionally.

Author: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Zhijie Hou <houzj.fnst@fujitsu.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Backpatch-through: 17, where it was introduced
Discussion: https://postgr.es/m/TY4PR01MB177184FF9EE916F577E1F554194082@TY4PR01MB17718.jpnprd01.prod.outlook.com
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contrib jsonb_plperl, jsonb_plpython: Fix unguarded recursion and loops. 2026-06-17 11:04:41 -04:00
doc Doc: Clarify that publication exclusions track table identity. 2026-06-18 08:02:33 +05:30
src Avoid stale slot access after dropping obsolete synced slots. 2026-06-18 09:50:33 +05:30
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configure Stamp 19beta1. 2026-06-01 16:02:13 -04:00
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GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
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meson.build Stamp 19beta1. 2026-06-01 16:02:13 -04:00
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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.

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/.