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From: Noah Misch <noah@leadboat.com>
To: Andres Freund <andres@anarazel.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Intermittent buildfarm failures on wrasse
Date: Thu, 14 Apr 2022 22:21:25 -0700
Message-ID: <20220415052125.GD862547@rfd.leadboat.com> (raw)
In-Reply-To: <20220415051205.6abhlilh6fnjgohr@alap3.anarazel.de>
References: <1521388.1649953580@sss.pgh.pa.us>
	<1547912.1649971995@sss.pgh.pa.us>
	<CAH2-Wz=DHY2LV7=2aVd=qz6AbQhFK7KJRNL5ZwgB7dyno_gzdg@mail.gmail.com>
	<1553951.1649975018@sss.pgh.pa.us>
	<CAH2-WzngTjUk_65ESmrMf40WTqasrmWG0gpwnvcN+mXsoXT7qQ@mail.gmail.com>
	<CAH2-WznXXkkfE_y9ieaHkEQj31HeMAqJBtJPmDY+EpyVg1QywQ@mail.gmail.com>
	<1570894.1649986347@sss.pgh.pa.us>
	<20220415015249.kfsqxujrf2bn2wz6@alap3.anarazel.de>
	<20220415024515.GA862547@rfd.leadboat.com>
	<20220415051205.6abhlilh6fnjgohr@alap3.anarazel.de>

On Thu, Apr 14, 2022 at 10:12:05PM -0700, Andres Freund wrote:
> On 2022-04-14 19:45:15 -0700, Noah Misch wrote:
> > I suspect the failure is somehow impossible in "check".  Yesterday, I cranked
> > up the number of locales, so there are now a lot more installcheck.  Before
> > that, each farm run had one "check" and two "installcheck".  Those days saw
> > ten installcheck failures, zero check failures.
> 
> I notice that the buildfarm appears to run initdb with syncing enabled
> ("syncing data to disk ... ok" in the initdb steps).  Whereas pg_regress
> uses --no-sync.

Yep.

> I wonder if that's what makes the difference? Now that you reproduced
> it, does it still reproduce with --no-sync added?

It does; the last version of my script used "initdb -N ...".

> Also worth noting that pg_regress doesn't go through pg_ctl...

Hmmm.





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