Message-ID: <c733dae0-15ba-bcdd-e465-1a9f2fdefebf@enterprisedb.com>
Date: Wed, 23 Feb 2022 16:36:32 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.5.0
Subject: Re: BUG #17406: Segmentation fault on GiST index after 14.2 upgrade
Content-Language: en-US
To: Victor Yegorov <vyegorov@gmail.com>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>,
 Alexander Korotkov <a.korotkov@postgrespro.ru>
References: <17406-71e02820ae79bb40@postgresql.org>
 <cb3a777a-99c7-f671-532d-b828a2223502@enterprisedb.com>
 <CAGnEbojzf-uObyWeu1MPNKaYsnL_U2kg48K6Ec43waPRBu3DrQ@mail.gmail.com>
 <788a0a51-b1e3-3601-5783-3f6488796ec4@enterprisedb.com>
 <CAGnEboiQ-cnhXceFa9WfXk7y06fuVVsf9WcmEdPerjqth8QJxA@mail.gmail.com>
From: Tomas Vondra <tomas.vondra@enterprisedb.com>
In-Reply-To: 
 <CAGnEboiQ-cnhXceFa9WfXk7y06fuVVsf9WcmEdPerjqth8QJxA@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Archived-At: 
 <https://www.postgresql.org/message-id/c733dae0-15ba-bcdd-e465-1a9f2fdefebf%40enterprisedb.com>
Precedence: bulk

>
> I got approval to send a table with its data and index in the subject
> datafile.
> Taken from the v14 database.
> 

Thanks for the data! I've been able to reproduce the issue (load into
12, pg_upgrade to 14 and run the query). After bisecting this for a
while, this seems like a bug in PG13 commit

commit 911e70207703799605f5a0e8aad9f06cff067c63 (HEAD)
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date:   Mon Mar 30 19:17:11 2020 +0300

    Implement operator class parameters

    ...

It works fine when upgrading to an earlier build, and crashes since this
commit. I haven't investigated this further, but I guess there's some
thinko in gist_ltree_ops, affecting how we interpret existing indexes.

Alexander, any ideas?


regards

-- 
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company