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From: Thomas Munro <thomas.munro@gmail.com>
To: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: Noah Misch <noah@leadboat.com>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Andres Freund <andres@anarazel.de>
Subject: Re: conchuela timeouts since 2021-10-09 system upgrade
Date: Tue, 16 Nov 2021 10:23:02 +1300
Message-ID: <CA+hUKGJHA24SFAQureqf0EodkXv0W0hAZybcU9OpZAp3O2uegQ@mail.gmail.com> (raw)
In-Reply-To: <0CD98EB5-71AC-4D84-BC90-93674B6330F4@yandex-team.ru>
References: <9BA43784-E4A7-4638-900C-FC9868C388FA@yandex-team.ru>
	<20211019030212.GB3403374@rfd.leadboat.com>
	<20211024050028.GA3310519@rfd.leadboat.com>
	<64835CF9-D9AA-49BF-A685-01C23B1023C1@yandex-team.ru>
	<20211024161942.GB3945842@rfd.leadboat.com>
	<640FA6DC-A998-4499-B3B4-2773685B8C56@yandex-team.ru>
	<20211029025600.GB298507@rfd.leadboat.com>
	<20211110041541.GA971565@rfd.leadboat.com>
	<4C43D751-8E0B-478D-B358-7C52BB5AFDAA@yandex-team.ru>
	<633901636829263@sas1-7f179212b74f.qloud-c.yandex.net>
	<20211114000952.GA1117894@rfd.leadboat.com>
	<0CD98EB5-71AC-4D84-BC90-93674B6330F4@yandex-team.ru>

On Mon, Nov 15, 2021 at 8:20 PM Andrey Borodin <x4mmm@yandex-team.ru> wrote:
> I've sent some diagnostics info to Thomas offlist, but I do not understand how it can be used...

Summary for the record: defunct child, and gdb showed perl blocked in
select(), and ps revealed that Dragonfly internally maps select() onto
kevent() (wchan = kqread), which is interesting, but apparently not
new.  (Hmmm, /me eyes the recent changes to events reported on
half-closed pipes[1].)

[1] https://github.com/DragonFlyBSD/DragonFlyBSD/commits/master/sys/kern/sys_generic.c





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  Cc: thomas.munro@gmail.com, x4mmm@yandex-team.ru, noah@leadboat.com, pgsql-bugs@lists.postgresql.org, michael@paquier.xyz, tgl@sss.pgh.pa.us, pg@bowt.ie, andres@anarazel.de
  Subject: Re: conchuela timeouts since 2021-10-09 system upgrade
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