From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Alexander Lakhin <exclusion(at)gmail(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
Subject: | Re: BUG #17255: Server crashes in index_delete_sort_cmp() due to race condition with vacuum |
Date: | 2021-11-11 01:03:25 |
Message-ID: | 20211111010325.hpwxetvktafkyulw@alap3.anarazel.de |
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Lists: | pgsql-bugs |
Hi,
On 2021-11-10 13:40:25 -0800, Peter Geoghegan wrote:
> On Wed, Nov 10, 2021 at 1:04 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> > On Wed, Nov 10, 2021 at 11:20 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
> > > The way this definitely breaks - I have been able to reproduce this in
> > > isolation - is when one tuple is processed twice by heap_prune_chain(), and
> > > the result of HeapTupleSatisfiesVacuum() changes from
> > > HEAPTUPLE_DELETE_IN_PROGRESS to DEAD.
> >
> > I had no idea that that was now possible. I really think that this
> > ought to be documented centrally.
>
> BTW, is it just a coincidence that we have only seen these problems
> with pg_class? Or does it have something to do with the specifics of
> VISHORIZON_CATALOG/horizons.catalog_oldest_nonremovable, or something
> else along those lines?
It's the testcase. The test instructions specify autovacuum=off and only
pg_class is vacuumed. There are a other hot updates than to pg_class, but
there's much less HOT pruning on them because there's no loop of VACUUMs.
Greetings,
Andres Freund
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