From owner-freebsd-stable@freebsd.org Wed Dec 9 15:47:57 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 918A29D5865 for ; Wed, 9 Dec 2015 15:47:57 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mx1.eichornenterprises.com (mx1.eichornenterprises.com [104.236.13.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx1.eichornenterprises.com", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 567581BED for ; Wed, 9 Dec 2015 15:47:56 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mail.eichornenterprises.com (cpe-184-59-147-149.neo.res.rr.com [184.59.147.149]) by mx1.eichornenterprises.com (OpenSMTPD) with ESMTP id 0d1666a3; Wed, 9 Dec 2015 10:47:53 -0500 (EST) Received: by mail.eichornenterprises.com (OpenSMTPD) with ESMTPSA id d7186912 TLS version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO; Wed, 9 Dec 2015 10:47:52 -0500 (EST) Message-ID: <1449676072.2727.8.camel@michaeleichorn.com> Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 From: "Michael B. Eichorn" To: Jan Bramkamp , freebsd-stable@freebsd.org Date: Wed, 09 Dec 2015 10:47:52 -0500 In-Reply-To: <56680148.9070601@rlwinm.de> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> <1449619470.31831.9.camel@michaeleichorn.com> <56680148.9070601@rlwinm.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-l6q25AVITlfYgqnSM+0J" X-Mailer: Evolution 3.18.1 Mime-Version: 1.0 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Dec 2015 15:47:57 -0000 --=-l6q25AVITlfYgqnSM+0J Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-12-09 at 11:24 +0100, Jan Bramkamp wrote: >=20 > On 09/12/15 01:04, Michael B. Eichorn wrote: > > On Tue, 2015-12-08 at 16:31 -0600, Dustin Wenz wrote: > > > I suspect this is a zfs bug that is triggered by the access > > > patterns > > > in the periodic scripts. There is significant load on the system > > > when > > > the scheduled processes start, because all jails execute the same > > > scripts at the same time. > > >=20 > > > I've been able to alleviate this problem by disabling the > > > security > > > scans within the jails, but leave it enabled on the root host. > >=20 > > To avoid the problem of jails all starting things at the same time, > > use > > the cron(8) flags -j and -J to set a 'jitter' which will cause cron > > to > > sleep for a random period of specified duration (60 sec max). Cron > > flags can be set using the rc.conf variable 'cron_flags'. >=20 > While jitter would reduce the resource contention a thundering herd > of=20 > cronjobs shouldn't cause the kernel to divide by zero. Spreading the=20 > load by introducing jitter to cronjobs might hide the problem, but it > still needs further analysis. I concur, used the word 'avoid' in the sense that this was an improvement to his work-around (which is all that I quoted). I had no intent to imply that it was the solution to the bug, which of course deserves solving. Sorry for any confusion, I will try to be more clear in the future. --=-l6q25AVITlfYgqnSM+0J Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEqAw ggYwMIIFGKADAgECAgMOXcYwDQYJKoZIhvcNAQELBQAwgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVu dCBDQTAeFw0xNTA2MTMyMDI0NDZaFw0xNjA2MTQwMDM1NTBaMEgxHzAdBgNVBAMMFmlrZUBtaWNo YWVsZWljaG9ybi5jb20xJTAjBgkqhkiG9w0BCQEWFmlrZUBtaWNoYWVsZWljaG9ybi5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDJVdWALPz5h2s5zUQGIJYl6Vp8FPtZNko8q/3s crCsxXJLprMaDdpnqTsmkbmEfKvsqPQE6HVOpGxVRTl/tCm+VvouW9eY9ITMigb1OnHdU13CKO0j drgeU1nHst0qxwsIofRD7nC4dakT6exnrVndlBmLrf/bLPh2qOM8YK5qKK6m33fE7AyYrwiYAWFT 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