Re: Berserk Autovacuum (let's save next Mandrill)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>
Cc: David Rowley <dgrowleyml(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Andres Freund <andres(at)anarazel(dot)de>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Darafei Komяpa Praliaskouski <me(at)komzpa(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Michael Banck <mbanck(at)gmx(dot)net>
Subject: Re: Berserk Autovacuum (let's save next Mandrill)
Date: 2020-03-31 20:48:30
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Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> I had a go at reproducing this. I wasn't able to produce the reported
> failure, but I can reliably produce an Assert failure that may be
> related by doing a VACUUM FULL simultaneously with an ANALYZE that is
> generating extended stats, which produces:
> ...
> It looks to me as though the problem is that statext_store() needs to
> take its lock on pg_statistic_ext_data *before* searching for the
> stats tuple to update.

Hmm, yeah, that seems like clearly a bad idea.

> It's late here, so I haven't worked up a patch yet, but it looks
> pretty straightforward.

I can take care of it.

regards, tom lane

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