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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: buildfarm: could not read block 3 in file "base/16384/2662": read only 0 of 8192 bytes
Date: Wed, 29 Aug 2018 16:38:49 -0400
Message-ID: <32048.1535575129@sss.pgh.pa.us> (raw)
In-Reply-To: <20180829194527.ohfvlswk2g3fkma7@alap3.anarazel.de>
References: <fcab55ec-660a-bc43-7fe1-09af3665e89a@2ndquadrant.com>
	<20180811140823.gyxqbtjbr5uitgsf@alap3.anarazel.de>
	<20180828075213.yqyl3w2gpd5heopd@alap3.anarazel.de>
	<20180829025658.brk3hfdczo3f73al@alap3.anarazel.de>
	<6970.1535512705@sss.pgh.pa.us>
	<20180829032714.6yu3bxdywcvyj2li@alap3.anarazel.de>
	<20180829032908.o46wdjmti6c6dfep@alap3.anarazel.de>
	<20180829083730.n645apqhb2gyih3g@alap3.anarazel.de>
	<17825.1535556627@sss.pgh.pa.us>
	<22112.1535561767@sss.pgh.pa.us>
	<20180829194527.ohfvlswk2g3fkma7@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> On 2018-08-29 12:56:07 -0400, Tom Lane wrote:
>> BTW, I now have a theory for why we suddenly started seeing this problem
>> in mid-June: commits a54e1f158 et al added a ScanPgRelation call where
>> there had been none before (in RelationReloadNailed, for non-index rels).
>> That didn't create the problem, but it probably increased the odds of
>> seeing it happen.

> Yea.  Doesn't explain why it's only really visible on the BF in
> 11/master though :/

Probably we changed around the tests that run in parallel with vacuum.sql
enough during v11 to make it happen with noticeable probability.  I think
this is sufficient evidence that it's happening now in the back branches:

https://www.postgresql.org/message-id/20180829140149.GO23024@telsasoft.com

			regards, tom lane




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