| 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 21:16:39 |
| Message-ID: | 30041.1585689399@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
I wrote:
> 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.
I pushed a fix for that, but I think it must be unrelated to the
buildfarm failures we're seeing. For that coding to be a problem,
it would have to run concurrently with a VACUUM FULL or CLUSTER
on pg_statistic_ext_data (which would give all the tuples new TIDs).
AFAICS that won't happen with the tests that are giving trouble.
regards, tom lane
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