Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mgIR9-0006Ie-B6 for pgsql-bugs@arkaria.postgresql.org; Fri, 29 Oct 2021 03:20:11 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1mgIR7-0008H0-CC for pgsql-bugs@arkaria.postgresql.org; Fri, 29 Oct 2021 03:20:09 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mgIR7-0008Gr-4t for pgsql-bugs@lists.postgresql.org; Fri, 29 Oct 2021 03:20:09 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mgIR4-0006Be-EB for pgsql-bugs@lists.postgresql.org; Fri, 29 Oct 2021 03:20:08 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 19T3JuK8581194; Thu, 28 Oct 2021 23:19:56 -0400 From: Tom Lane To: Noah Misch cc: Andrey Borodin , PostgreSQL mailing lists , Michael Paquier , Peter Geoghegan , Andres Freund Subject: Re: conchuela timeouts since 2021-10-09 system upgrade In-reply-to: <20211029025600.GB298507@rfd.leadboat.com> References: <20210920044143.GA3414844@rfd.leadboat.com> <593C6C66-F19E-412A-9896-F1F5B272424A@yandex-team.ru> <20210925201012.GC4134968@rfd.leadboat.com> <20211017151205.GA2384251@rfd.leadboat.com> <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> Comments: In-reply-to Noah Misch message dated "Thu, 28 Oct 2021 19:56:00 -0700" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <581192.1635477596.1@sss.pgh.pa.us> Content-Transfer-Encoding: quoted-printable Date: Thu, 28 Oct 2021 23:19:56 -0400 Message-ID: <581193.1635477596@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk Noah Misch writes: > 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 tes= ts on > dragonfly 6+. Since the breakage has been limited to so few tests, I'm > optimistic that a better workaround will present itself. It indeed is looking like 7f580aa made the problem go away on conchuela, but do we understand why? The only theory I can think of is "kernel bug", but while that's plausible for prairiedog it seems hard to credit for a late-model BSD kernel. regards, tom lane