Re: BUG #19500: pgrepack logical decoding plugin can crash assert builds via SQL decoding API

From: Antonin Houska <ah(at)cybertec(dot)at>
To: Srinath Reddy Sadipiralla <srinath2133(at)gmail(dot)com>
Cc: alvherre(at)kurilemu(dot)de, n(dot)kalinin(at)postgrespro(dot)ru, pgsql-bugs(at)lists(dot)postgresql(dot)org, b(at)ida(dot)kurilemu(dot)internal
Subject: Re: BUG #19500: pgrepack logical decoding plugin can crash assert builds via SQL decoding API
Date: 2026-06-03 07:30:21
Message-ID: 33766.1780471821@localhost
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Srinath Reddy Sadipiralla <srinath2133(at)gmail(dot)com> wrote:

> Could we reject the pgrepack plugin at slot creation instead, in
> pg_create_logical_replication_slot() and the CREATE_REPLICATION_SLOT
> command, so misuse gets a clear "reserved for REPACK (CONCURRENTLY)"
> error up front, before any decoding? REPACK creates its slot directly via
> ReplicationSlotCreate(), so it's unaffected, and the begin-callback check
> with magic guard can stay as the internal safety net.
> Happy to be told this isn't worth special-casing :)

Another possible approach: restrict the use of the plugin to the REPACK
decoding worker.

--
Antonin Houska
Web: https://www.cybertec-postgresql.com

Attachment Content-Type Size
repack_reserve_plugin_name.diff text/x-diff 2.3 KB

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