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From: Antonin Houska <[email protected]>
To: Alexander Lakhin <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Hayato Kuroda (Fujitsu) <[email protected]>
Cc: Srinath Reddy Sadipiralla <[email protected]>
Cc: Mihail Nikalayeu <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: Pg Hackers <[email protected]>
Cc: Robert Treat <[email protected]>
Subject: Re: Adding REPACK [concurrently]
Date: Fri, 10 Apr 2026 12:57:47 +0200
Message-ID: <121156.1775818667@localhost> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

Alexander Lakhin <[email protected]> wrote:

> Could you please look at an assertion failure produced by the following
> script, starting from 0d3dba38c:?
> createdb db1
> createdb db2
> 
> echo "
> CREATE TABLE t0 (a text);
> BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
> INSERT INTO t0 VALUES ('a');
> SELECT pg_sleep(1);
> " | psql db1 &
> 
> echo "
> CREATE TABLE t1 (id int PRIMARY KEY);
> CREATE TABLE t2 (id int PRIMARY KEY, a TEXT, FOREIGN KEY (id) REFERENCES t1);
> SET min_parallel_table_scan_size = 1;
> REPACK (CONCURRENTLY) t2;
> " | psql db2
> wait
> 
> It triggers for me:
> TRAP: failed Assert("TransactionIdPrecedesOrEquals(TransactionXmin, RecentXmin)"), File: "procarray.c", Line: 2071, PID: 3529520

Attached is a fix that works for me.

Nevertheless, REPACK (CONCURRENTLY) in your test goes ahead only due to commit
0d3dba38c7, which will probably be reverted [1]. Then REPACK will wait for the
transaction in the other database (db1) to complete before it can actually
start.

Thanks for the report!

[1] https://www.postgresql.org/message-id/cdgw4sbbfcgk6du3iv54r2dgiy4tfywoklbotlmj4irxavdcr3@glxfw5jj277...

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

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