Date: Tue, 9 Nov 2021 20:15:41 -0800
From: Noah Misch <noah@leadboat.com>
To: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>,
	Michael Paquier <michael@paquier.xyz>, Tom Lane <tgl@sss.pgh.pa.us>,
	Peter Geoghegan <pg@bowt.ie>, Andres Freund <andres@anarazel.de>
Subject: Re: conchuela timeouts since 2021-10-09 system upgrade
Message-ID: <20211110041541.GA971565@rfd.leadboat.com>
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On Thu, Oct 28, 2021 at 07:56:00PM -0700, Noah Misch wrote:
> On Sun, Oct 24, 2021 at 09:03:27PM +0300, Andrey Borodin wrote:
> > > 24 окт. 2021 г., в 19:19, Noah Misch <noah@leadboat.com> написал(а):
> > > These failures started on 2021-10-09, the day conchuela updated from DragonFly
> > > v4.4.3-RELEASE to DragonFly v6.0.0-RELEASE.  It smells like a kernel bug.
> > > Since the theorized kernel bug seems not to affect
> > > src/test/subscription/t/015_stream.pl, I wonder if we can borrow a workaround
> > > from other tests.  One thing in common with src/test/recovery/t/017_shm.pl and
> > > the newest failure sites is that they don't write anything to the child stdin.
> 
> > >  If not, does passing the script via stdin, like "pgbench -f-
> > > <script.sql", work around the problem?
> > 
> > I'll test it tomorrow, the refactoring does not seem trivial given we use many simultaneous scripts.
> 
> Did that work?  Commit 7f580aa should make this unnecessary for v12+
> contrib/amcheck tests, but older branches still need a fix, and 017_shm.pl
> needs a fix in all branches.  A backup plan is just to skip affected tests on
> dragonfly 6+.  Since the breakage has been limited to so few tests, I'm
> optimistic that a better workaround will present itself.

Is this still in your queue, or not?  The conchuela breakage in
src/test/recovery and v11+v10 src/bin/pgbench is a large source of buildfarm
noise right now.