From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Alexey Ermakov <alexey(dot)ermakov(at)dataegret(dot)com> |
Cc: | Maxim Boguk <maxim(dot)boguk(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>, Peter Geoghegan <pg(at)bowt(dot)ie>, Michael Paquier <michael(at)paquier(dot)xyz> |
Subject: | Re: BUG #17268: Possible corruption in toast index after reindex index concurrently |
Date: | 2021-11-08 18:36:46 |
Message-ID: | 20211108183646.r3y6pldylxngxwl4@alap3.anarazel.de |
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Lists: | pgsql-bugs |
Hi,
On 2021-11-08 17:04:40 +0600, Alexey Ermakov wrote:
> I was told that application inserts rows into given table with queries like:
>
> INSERT INTO zz (id, body) VALUES (?, ?) ON CONFLICT (id) DO NOTHING
>
> inside transaction. It's possible to attempt to insert row with same id
> several times inside one transaction (in that case usually that id is new
> one i.e. was not presented in the table before that transaction).
>
> Hope it could help in some way.
It did. I've managed to reproduce an issue like this. I'm still narrowing down
the reproducer, but here's what I have so far:
DROP TABLE IF EXISTS wide; CREATE TABLE wide(id serial primary key, wide text);
pgbench -n -Mprepared -T1000 -f ~/tmp/insert_cci_bug.sql -c 16 -j 16 postgres
in concurrent psql
SELECT indrelid::regclass, indexrelid::regclass, bt_index_parent_check(indexrelid::regclass, true) FROM pg_index WHERE indrelid = (SELECT reltoastrelid FROM pg_class WHERE oid = 'wide'::regclass);
REINDEX INDEX CONCURRENTLY pg_toast.pg_toast_331092_index;
usually after 1-3 iterations the index is corrupt. Reproduces both in 13 and
HEAD.
Greetings,
Andres Freund
Attachment | Content-Type | Size |
---|---|---|
insert_cci_bug.sql | application/sql | 1.2 KB |
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