Re: Fix bug in multixact Oldest*MXactId initialization and access

From: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Sami Imseih <samimseih(at)gmail(dot)com>, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Fix bug in multixact Oldest*MXactId initialization and access
Date: 2026-03-03 16:59:34
Message-ID: 824fe90a-9954-4964-a177-bc8789f06d13@iki.fi
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On 03/03/2026 17:22, Tom Lane wrote:
> Heikki Linnakangas <hlinnaka(at)iki(dot)fi> writes:
>> Ok, here's another version of Sami's repro. I realized that it doesn't
>> even need concurrent sessions, so I moved it to the main regression test
>> suite, into the 'prepared_xacts' test. Looks good?
>
> Not directly relevant to the thing being tested here, but ...
> I wonder if we couldn't reduce future maintenance effort for
> prepared_xacts_1.out by modifying that test script to make an
> early exit if prepared transactions are disabled.

+1, I was just thinking the same.

Here's a patch to do that. I'll backpatch this to all supported
versions, to make backpatching test changes less painful in the future.

- Heikki

Attachment Content-Type Size
v2-0001-Skip-prepared_xacts-test-if-max_prepared_transact.patch text/x-patch 9.4 KB
v2-0002-Add-test-for-row-locking-and-multixids-with-prepa.patch text/x-patch 3.5 KB

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