Re: BUG #14261: Hanged randomly in hash_seq_search

From: "Amaury Decreme" <amdecreme(at)airfrance(dot)fr>
To: Julien Rouhaud <julien(dot)rouhaud(at)dalibo(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org,Ronan Dunklau <ronan(dot)dunklau(at)dalibo(dot)com>,Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,"Patrick Vergne" <pavergne(at)airfrance(dot)fr>, Stéphane Tachoires <sttachoires(at)airfrance(dot)fr>
Subject: Re: BUG #14261: Hanged randomly in hash_seq_search
Date: 2016-07-20 07:27:06
Message-ID: OF22B3A348.8F80F213-ONC1257FF6.00289373-C1257FF6.0028EEF1@LocalDomain
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Thanks for your answers.

I'm going to fill this bug on pg_qualstats repo.

Best regards,

Amaury Decreme
Capacity Management team

Phone +33 4 97283060 / 70 83060
Mail amdecreme(at)airfrance(dot)fr
Jabber amdecreme(at)jabber(dot)airfrance(dot)fr
(Home office on Friday: +33 6 63 99 83 13)
Air France KLM


De : Julien Rouhaud <julien(dot)rouhaud(at)dalibo(dot)com>

A : Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, amdecreme(at)airfrance(dot)fr

Cc : pgsql-bugs(at)postgresql(dot)org, Ronan Dunklau <ronan(dot)dunklau(at)dalibo(dot)com>

Date: 19/07/2016 20:00

Objet : Re: [BUGS] BUG #14261: Hanged randomly in hash_seq_search

On 19/07/2016 18:58, Tom Lane wrote:
> amdecreme(at)airfrance(dot)fr writes:
>> The process can be found stuck in the hash_seq_search().
>
>> Call stack:
>> #0 0x000000000075e919 in hash_seq_search ()
>> #1 0x00007fd0af74fb2b in pgqs_entry_dealloc ()
>> from /tech/postgres/9.4.1/server/lib/pg_qualstats.so
>> #2 0x00007fd0af750a15 in pgqs_ExecutorEnd ()
>> from /tech/postgres/9.4.1/server/lib/pg_qualstats.so
>> #3 0x000000000055dade in PortalCleanup ()
>> #4 0x000000000077438a in PortalDrop ()
>> #5 0x000000000077472a in PreCommit_Portals ()
>> #6 0x00000000004b36ec in CommitTransaction ()
>
> I do not know what pg_qualstats.so is, but it's certainly not part of the
> PG core distribution. I suggest asking its author(s) about known bugs
> in their code ...
>

Culprit here, and unfortunately that's not a bug that've already been
reported.

Amaury, could you instead send a bug report on
https://github.com/dalibo/pg_qualstats/issues ?

--
Julien Rouhaud
http://dalibo.com - http://dalibo.org

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