Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eNL4c-00062d-0O for pgsql-admin@arkaria.postgresql.org; Fri, 08 Dec 2017 16:00:26 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eNL4b-0001sC-KJ for pgsql-admin@arkaria.postgresql.org; Fri, 08 Dec 2017 16:00:25 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1eNL4b-0001rz-72 for pgsql-admin@lists.postgresql.org; Fri, 08 Dec 2017 16:00:25 +0000 Received: from out3-smtp.messagingengine.com ([66.111.4.27]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1eNL4X-0005PQ-Oo for pgsql-admin@postgresql.org; Fri, 08 Dec 2017 16:00:24 +0000 Received: from compute7.internal (compute7.nyi.internal [10.202.2.47]) by mailout.nyi.internal (Postfix) with ESMTP id CF2D020DF6; Fri, 8 Dec 2017 11:00:19 -0500 (EST) Received: from frontend2 ([10.202.2.161]) by compute7.internal (MEProxy); Fri, 08 Dec 2017 11:00:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=Rf62kX Aw8ujGqBG48+SIHeOk0SPEnHmryvT+nP3YWzs=; b=fW4ZWYQFjwpgBK9FUz6d59 LJum2Ky512OmVTB5Kq98zpdJreya0XtunG5jTtzLuRIK7v7jJ7CluYmJ3EzxLLhP kb5TvPJrAQNemRNScBI74i9/RlzkKE6QWQYAP2udKxWJejxzMEBux7V0Lgfn+f90 354NvXcHgM2mMJ7aw5vlkC6x2gphQMo4QSTW1g/bbvZDzL2iqmk1Q6va13pfEBx1 1vWRLxWk1iwMmvmywdaPMyzHqr2manjyJiaj7yTXRdWzD1c4h80Ltfb08pDQQt9u mvPUJu0Yo4l+r9wskwIUOJs5w1+92MXMVKVlTLYgknddfkz51tZ/M5gtLRrAb3rQ == X-ME-Sender: Received: from april.local (c-73-13-66-39.hsd1.pa.comcast.net [73.13.66.39]) by mail.messagingengine.com (Postfix) with ESMTPA id 37916248BA; Fri, 8 Dec 2017 11:00:19 -0500 (EST) Subject: Re: [ADMIN] Re: WARNING: terminating connection because of crash of another server process To: Tom Lane , Scott Whitney References: <6102.1505834313@sss.pgh.pa.us> Cc: "Saeed Ahmed (DB)" , "pgsql-admin@postgresql.org" From: Peter Eisentraut Organization: 2ndQuadrant Message-ID: <8aab0ed1-7559-cbb9-2e64-d4965f413b58@2ndquadrant.com> Date: Fri, 8 Dec 2017 11:00:18 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <6102.1505834313@sss.pgh.pa.us> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 9/19/17 11:18, Tom Lane wrote: > Scott Whitney writes: >> It looks like maybe your semaphores are getting deleted out from under PG as a guess. > > Yeah. See > > https://www.postgresql.org/docs/devel/static/kernel-resources.html#systemd-removeipc > > (Probably we should back-patch that section into older versions of the > docs, as it's not at all PG-version-specific.) done -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services