From owner-freebsd-stable@freebsd.org Wed Apr 28 15:41:22 2021 Return-Path: Delivered-To: freebsd-stable@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id EBF745F818F for ; Wed, 28 Apr 2021 15:41:22 +0000 (UTC) (envelope-from rmacklem@uoguelph.ca) Received: from CAN01-TO1-obe.outbound.protection.outlook.com (mail-eopbgr670071.outbound.protection.outlook.com [40.107.67.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "DigiCert Cloud Services CA-1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FVjXd56WFz4nrl; Wed, 28 Apr 2021 15:41:21 +0000 (UTC) (envelope-from rmacklem@uoguelph.ca) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=PgeF6htfI0aNWHH4jE+Xqsmg25Lz9qGDN6X/tI2lo2//SfFrMJuU+A/T5GOi5ORuF4rlIWQyLhMmk7MepbMmdXXR15LrYiqhx2kOnQmEG6erccVx1qocDS1KL3NdD8H2ay/xBGufdfBYTwt2Il1zRVK8v4yYo+X0dNqFueMTg200/jdtUnnkbZvm707uscsiusDeXldk3n2Zet5G5o8WS1eeXXXxQiJ6Pk8MKdPmImF2pQNTYhPF8Vwu246XjpcnU38e1RAdp5jROtSwzeSmxi+gvlfPiQkAmE1apqdQazlCFEbjwAVyBHJBtnlP+TtZKuR241A09pUP08KNP9+l/A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=25jkA8gY0vndSLUIwzBqPXNzGXMiEqZ/bCbAO77cMXs=; b=AVa7Cf/ltdEvml/gnzAzVWvOp0Cgx20XLPsGM06EhDN8KHBiRoMHNL1YiosNUYgTCV7AytGJ8emX5pOpgcrF0pGfZ15zvxtSoJjurO1Llcc4syYa6/nxR6lApsiKeOIPgE2lQdiLMCW5TZNoitGL1Kxjs3RR7uIRRqzkQcQTXYvpTtwO1u3MLnjD5fPs8CEv89NpPXCPbzLqbrBW+ZiCwt/Qe36TxYlCQRhABPTdPM5k9iJaxInCH1FwSL9QtgbheZCXdYtx8Ne2OGS5+w0TqHZa7lwizwaBg9ZIMXRspjpc02tzMijKROTEFnx8Jl05zgJNPC2WYgtgISMIxzWbJA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=uoguelph.ca; dmarc=pass action=none header.from=uoguelph.ca; dkim=pass header.d=uoguelph.ca; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uoguelph.ca; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=25jkA8gY0vndSLUIwzBqPXNzGXMiEqZ/bCbAO77cMXs=; b=Y27d55is5s+48cCclvsJsb3MWXuOSbgzDXVa7enKHjm4uJexedt3KPFCdvTmN7NMWMarBLPa/soqc/ExJVnqkS1QT1rWBgk3Rah27ndryJlBTHXE9vdbaY+++/vo7HHi1pFYqnyI0gDEqlzrZsrCluoSeT4kJlCOnEGzEehpX8lbZTT/MadgDqywYFncVQpWQGOhiljEW7nO7p/7lOwlFtSgj4Q8CV0KsLkkUdwkdlIBVD7oA0EBGvaAlE3ZnV4PyvERjGkffiNEsoGmr4yrNmQtSImIkiwmO5Sy0Yu4qQkjGs3z2ka/yNjiilhABAV7UJjhoRWOiRuQQv0PLaxrVw== Received: from YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c00:19::29) by YQBPR0101MB4888.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:23::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.25; Wed, 28 Apr 2021 15:41:20 +0000 Received: from YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::1c05:585a:132a:f08e]) by YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::1c05:585a:132a:f08e%4]) with mapi id 15.20.4065.027; Wed, 28 Apr 2021 15:41:20 +0000 From: Rick Macklem To: freebsd-stable CC: Peter Eriksson , Ryan Moeller , Garrett Wollman Subject: wanna solve the Linux NFSv4 client puzzle? Thread-Topic: wanna solve the Linux NFSv4 client puzzle? Thread-Index: AQHXPEHIsjwmd971wkuLdHVmW5Ho6A== Date: Wed, 28 Apr 2021 15:41:20 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 49c825f2-e4bd-4e6c-a7af-08d90a5c11ea x-ms-traffictypediagnostic: YQBPR0101MB4888: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4502; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM; PTR:; CAT:NONE; SFS:(366004)(346002)(136003)(396003)(39850400004)(376002)(478600001)(6916009)(122000001)(786003)(8676002)(54906003)(8936002)(66446008)(66476007)(76116006)(55016002)(316002)(91956017)(64756008)(66556008)(66946007)(5660300002)(9686003)(83380400001)(7696005)(966005)(33656002)(2906002)(71200400001)(186003)(6506007)(52536014)(86362001)(38100700002)(4326008)(184893001)(554374003); DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata: =?iso-8859-1?Q?Hz5aldAOnBwsDDS6rPUeUbQfGc9rl3I3LL6VhWn6ZwHy5bbdGAHhPYXqoK?= =?iso-8859-1?Q?GMFEtPJjAI0ya3mys9CxUg8NmnebEx0BfE5Ebr3xrRhYedQy8V0aWuzRea?= =?iso-8859-1?Q?TsdLT7bVYkGqY4sD8zjEhd7tP1C7hPgP9UsfGx58NCqsDob2YaNJdbTIRu?= =?iso-8859-1?Q?WYZ1tPCv5YtW3KBgs33ZxU2p7Ymn2Onhth32WMwU/McyLfP4syAh46tQuo?= =?iso-8859-1?Q?VUDsbHLspQgpNF+Xw09ooGegsrGTtLi5anzTtLg48rSUWd33Hmz0XDiJQW?= =?iso-8859-1?Q?Ufespvjs1Gk0XTqE+S8cyN47aHIb1ZgSW+aUCkVlmbiuSrw50+b7nfAOQ/?= =?iso-8859-1?Q?oDgZkcp2Lu754RzI1DypkRHzp5hz8zhxEZEvXjkSz7Gfj/Z2/Iq67fwUEd?= =?iso-8859-1?Q?tiiormqparufZbO2FCl3qvh30sYM/n1YJKoofNWJGbMNXk6UZK07IOKe/J?= =?iso-8859-1?Q?d4LX8t4JLRPCLiykdTXrsGWzrDRhx+piRFbWJO4WI0XsYqMsEHdcRe8mx6?= =?iso-8859-1?Q?yQEhulhV5ZYon3AQiVwvHikpQyWbsUxAJHHPaCDptYZU6nGrvvpllpeLvO?= =?iso-8859-1?Q?fTRXG3dTERGFfyzOG6sC0I/ydFZ9EobSqV8+pSla8gLl46hwmfobekD1YF?= =?iso-8859-1?Q?6NBvUP37rwReGMd5k/4/sGl+nps6EDEqQqJVaZ3h+R+oxomSji3RhLFjOT?= =?iso-8859-1?Q?aFvEsuYt5cPaMfqZnAG6/ezSynJlKq4gz2DZTUNADz03xN3Idji7seZ9MW?= =?iso-8859-1?Q?8sU/nP04bw9t4DPTiCFek0kOD84M1bh90l6//adDZNVeMh6EHOOfqdrNMS?= =?iso-8859-1?Q?HveT1ufx3JZxGLEYXiYnWkxIPVeOZpbEF57GRiOZy9ATsIYWiDHvmrxTlK?= =?iso-8859-1?Q?F7U0YpTnrnDkgbVxzH9NwApSWewCIpB9kM8JEbm3ljdsmUIbJDS0Rc6UUz?= =?iso-8859-1?Q?9TlDQchzNCXioONE6qIMnh1/TWYWcuN4nAUzNlE5nL6xhlLZcPXz4TgCGy?= =?iso-8859-1?Q?CgRvIXpOvD2Qk1c+4INtXWb9e+mMyXgOyJSAzQOw7bC3gOAA4JrLe244Ow?= =?iso-8859-1?Q?0W56D8mBWpyhDohcfCaRqhc2uxzjs0uuyh3j3Cr1i9gdNk3ykBlz24QMgy?= =?iso-8859-1?Q?g5n33o88RjmQ/7TdrdhqZ7xWP1DJ1YKjvjX1BcBhW+eySJ3eiMpTmtjDh2?= =?iso-8859-1?Q?Po/oHmY3G4VhJ+I+P0F0+vSnuX9XUEedRjQ0Q1LLFH0k3s9Qk1tYvNXSXJ?= =?iso-8859-1?Q?14kZW9mU46rUY7Iq7HLr9XIypMkZK4JT4LONgQBs3hoXtwykLWY5UTtXeN?= =?iso-8859-1?Q?JIjQSWGZg8QwYcvrAznArL9q4RXCqr1Y+l+peJpD9VPEvTVGIcB2WBZeQ/?= =?iso-8859-1?Q?31uK2DLxbm8xFmBk7jJn74RKAutgnet5uBPMkOp3I6tsTWMjiqpY4=3D?= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: uoguelph.ca X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 49c825f2-e4bd-4e6c-a7af-08d90a5c11ea X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Apr 2021 15:41:20.2496 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: be62a12b-2cad-49a1-a5fa-85f4f3156a7d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JLeUhmdLO2EwurvGUOC/mBWcOY5rYE8QCDm1c5YomNQnYC8Dug8OWrNdCGresekzlE90k0cT9Is1deGBHgPb7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: YQBPR0101MB4888 X-Rspamd-Queue-Id: 4FVjXd56WFz4nrl X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=uoguelph.ca header.s=selector1 header.b=Y27d55is; arc=pass (microsoft.com:s=arcselector9901:i=1); dmarc=pass (policy=none) header.from=uoguelph.ca; spf=pass (mx1.freebsd.org: domain of rmacklem@uoguelph.ca designates 40.107.67.71 as permitted sender) smtp.mailfrom=rmacklem@uoguelph.ca X-Spamd-Result: default: False [-5.10 / 15.00]; R_SPF_ALLOW(-0.20)[+ip4:40.107.0.0/16]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[uoguelph.ca:+]; DMARC_POLICY_ALLOW(-0.50)[uoguelph.ca,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; RCVD_IN_DNSWL_LOW(-0.10)[40.107.67.71:from]; SUBJECT_ENDS_QUESTION(1.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[40.107.67.71:from]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:8075, ipnet:40.104.0.0/14, country:US]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[uoguelph.ca:s=selector1]; FREEFALL_USER(0.00)[rmacklem]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DWL_DNSWL_LOW(-1.00)[uoguelph.ca:dkim]; SPAMHAUS_ZRD(0.00)[40.107.67.71:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.107.67.71:from]; MAILMAN_DEST(0.00)[freebsd-stable] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.34 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, 28 Apr 2021 15:41:23 -0000 Hi,=0A= =0A= I posted recently that enabling delegations should be avoided at this time,= =0A= especially if your FreeBSD NFS server has Linux client mounts...=0A= =0A= I thought some of you might be curious why, and I thought it would be=0A= more fun if you look for yourselves.=0A= To play the game, you need to download a packet capture:=0A= fetch https://people.freebsd.org/~rmacklem/twoclientdeleg.pcap=0A= and then load it into wireshark.=0A= =0A= 192.168.1.5 - FreeBSD server with all recent patches=0A= 192.168.1.6 - FedoraCore 30 (Linux 5.2 kernel) client=0A= 192.168.1.13 - FreeBSD client=0A= =0A= A few hints buried in RFC5661:=0A= - A fore channel is used for normal client->server RPCs and a back channel= =0A= is used for server->client callback RPCs.=0A= - After a new TCP is created, neither the fore nor back channels=0A= are bound to the connection.=0A= - Bindings channel(s) to a connection is done by BindConnectionToSession.= =0A= but an implicit binding for the fore channel is created when the first RP= C=0A= request with a Sequence operation in it is sent on the new TCP connection= .=0A= - A server->client callback cannot be done until the back channel is bound= =0A= via BindConnectionToServer.=0A= =0A= Ok, so we are ready...=0A= - Look at packet #s 3518->3605.=0A= - What is going on here?=0A= - How long does this take?=0A= --> One more hint. Starting with #3605, things are working again.=0A= There are actually 3 other examples of this in the pack capture.=0A= =0A= Btw, one of the weirdnesses is said to be fixed in Linux 5.3 and the other= =0A= in Linux 5.7, although I have not yet upgraded my kernel and tested this.= =0A= =0A= Have fun with it, rick=0A=