Received: by 2002:a25:f815:0:0:0:0:0 with SMTP id u21csp1936684ybd; Sun, 23 Jun 2019 20:31:39 -0700 (PDT) X-Google-Smtp-Source: APXvYqydq6JaKi7NS5qjG4UxAOb/ivhQgy775ZIiRzC2aouGZJ35NehrW3lVgAE34Tfq488KFEuc X-Received: by 2002:a17:90a:7d04:: with SMTP id g4mr22383237pjl.41.1561347099038; Sun, 23 Jun 2019 20:31:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1561347099; cv=none; d=google.com; s=arc-20160816; b=Zhfy1r/G5BSZkOrTJ6vNI1pY/k9tYFcxB5EX2VQPINnNzNssK6YZkgxj8ZrGa61CWn 5c/JYRK/IqWU6WSJpjPm3ML65zZCBtmzy8DC4Y9+lscCDKZE2mzm+Xyjk13gb1tpnZ5s Hp2dncUHr7xCr738RVwBA4lYt1wW5enEXDIsxQ6w8DwJ0oM12c5EDRmTgL1oGUBpxY8U km3jh6jTPanFO0LXdOA8ldXo6Yp87ZwlWjKcNEqAc6ZXr+6+CcQm4m4Gk2wHm1d6BvF5 M/FE8sMRGI+AZC8I2c9b8x5nspjsAoWr8a81LaE58b9l2SgAFQljWD6p8uhRKfOBxZi3 Ukbg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :content-id:content-language:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature:dkim-signature; bh=q07u1rapyj2+hD9nQJNdwWG04vJ74NHNepRzJEp7IGU=; b=IAoJ7KjH0YE8YwRt9zNl8x4EDHD+FyDm7Cxp5seviw6vvOWuJ1qUiaL/uyp98LVWxc qoQdIVNjkHyZ9yDxESqR7hOuBKPQs/yQTzctOYYYcrGxgboK5Wk11IiQXOASRUqgfPYR jq2ydIp5l0J8sIZpRXg3cFiqVAqM1gwEWbbd4EJVN7/kGgFjMrWO38XCfJHbkCfMfQY1 QcJPXswDlmPdbO6MPmr91N8tU1MdCTu+mn93WEhY5mRJTqtjQgGNiZlX3mofZwKHvhgK yX2tYwpoGo3hvZVpcCtmyMDY2sDba/3ccA4pqBc0IozTRDmTEjElWsuo6pZ/OTc5IwO5 vPfA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=BleYE8qB; dkim=pass header.i=@fb.onmicrosoft.com header.s=selector1-fb-onmicrosoft-com header.b=scLYkqUu; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 31si9675369plz.290.2019.06.23.20.31.20; Sun, 23 Jun 2019 20:31:39 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=BleYE8qB; dkim=pass header.i=@fb.onmicrosoft.com header.s=selector1-fb-onmicrosoft-com header.b=scLYkqUu; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727647AbfFXDaA (ORCPT + 99 others); Sun, 23 Jun 2019 23:30:00 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:9912 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726936AbfFXDaA (ORCPT ); Sun, 23 Jun 2019 23:30:00 -0400 Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.16.0.27/8.16.0.27) with SMTP id x5O3StHq013518; Sun, 23 Jun 2019 20:29:39 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : references : in-reply-to : content-type : content-id : content-transfer-encoding : mime-version; s=facebook; bh=q07u1rapyj2+hD9nQJNdwWG04vJ74NHNepRzJEp7IGU=; b=BleYE8qBT1IqCAPSKGA8n7XSuzUDW1gUpxBm2BJ4rx7bBHrlGgmmroB9yiy3tW2vZDkw 0Vcg2wbnWgfvOeTcHQe5P5lHYS9syHwS+TwlnUQ8xufFKK7ojTLFcQJMy5iCPQpf0BOU zZ1k8UkP5wNo/5ZRl2b+JgWeryW2sg7kUW4= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by m0089730.ppops.net with ESMTP id 2t9ftnmptb-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Sun, 23 Jun 2019 20:29:39 -0700 Received: from prn-mbx02.TheFacebook.com (2620:10d:c081:6::16) by prn-hub06.TheFacebook.com (2620:10d:c081:35::130) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.1713.5; Sun, 23 Jun 2019 20:29:38 -0700 Received: from prn-hub06.TheFacebook.com (2620:10d:c081:35::130) by prn-mbx02.TheFacebook.com (2620:10d:c081:6::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.1713.5; Sun, 23 Jun 2019 20:29:38 -0700 Received: from NAM04-BN3-obe.outbound.protection.outlook.com (192.168.54.28) by o365-in.thefacebook.com (192.168.16.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.1713.5 via Frontend Transport; Sun, 23 Jun 2019 20:29:38 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.onmicrosoft.com; s=selector1-fb-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=q07u1rapyj2+hD9nQJNdwWG04vJ74NHNepRzJEp7IGU=; b=scLYkqUu26NFs5HeUPmkyZlGwprPmeNctuyn88ldVFs1wtwpe/9bvVVODaC5CHIVZkP6YBBgIVfyL7EnZLZwdJFHmZS0If0g3rV8BKyeL/7pF+WlLHTfbpPYeAB9z8SEaAwLx8GzvKWE6uQNC8Rf82eW4eLhPLXsUqBsy4VcV58= Received: from BYAPR15MB2501.namprd15.prod.outlook.com (52.135.196.11) by BYAPR15MB2248.namprd15.prod.outlook.com (52.135.197.13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2008.16; Mon, 24 Jun 2019 03:29:23 +0000 Received: from BYAPR15MB2501.namprd15.prod.outlook.com ([fe80::60a3:8bdd:1ea2:3702]) by BYAPR15MB2501.namprd15.prod.outlook.com ([fe80::60a3:8bdd:1ea2:3702%7]) with mapi id 15.20.2008.014; Mon, 24 Jun 2019 03:29:22 +0000 From: Alexei Starovoitov To: Roman Gushchin , Alexei Starovoitov , "Daniel Borkmann" , Tejun Heo , "bpf@vger.kernel.org" CC: Kernel Team , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH bpf-next] bpf: fix cgroup bpf release synchronization Thread-Topic: [PATCH bpf-next] bpf: fix cgroup bpf release synchronization Thread-Index: AQHVKjTnfXTg4w17SUSy4+EivgF2L6aqJZmA Date: Mon, 24 Jun 2019 03:29:21 +0000 Message-ID: <91017042-1b59-6110-dfdd-13cfbbec1ae1@fb.com> References: <20190624023051.4168487-1-guro@fb.com> In-Reply-To: <20190624023051.4168487-1-guro@fb.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR15CA0030.namprd15.prod.outlook.com (2603:10b6:300:ad::16) To BYAPR15MB2501.namprd15.prod.outlook.com (2603:10b6:a02:88::11) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [2620:10d:c090:180::1:2311] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a096a053-f78d-478a-57f1-08d6f85425db x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:BYAPR15MB2248; x-ms-traffictypediagnostic: BYAPR15MB2248: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:2331; x-forefront-prvs: 007814487B x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(136003)(396003)(39860400002)(346002)(376002)(366004)(189003)(199004)(446003)(52116002)(14454004)(110136005)(99286004)(54906003)(8936002)(81166006)(2906002)(53936002)(305945005)(6246003)(81156014)(31686004)(7736002)(6486002)(229853002)(256004)(8676002)(14444005)(5024004)(6512007)(2501003)(71190400001)(71200400001)(6436002)(36756003)(316002)(76176011)(186003)(25786009)(102836004)(86362001)(2616005)(4326008)(53546011)(66946007)(73956011)(476003)(64756008)(66556008)(66476007)(68736007)(6506007)(66446008)(386003)(46003)(11346002)(478600001)(6116002)(486006)(31696002)(5660300002);DIR:OUT;SFP:1102;SCL:1;SRVR:BYAPR15MB2248;H:BYAPR15MB2501.namprd15.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: fb.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: fqKg1dux5aDJeYMSoH7eJJ5hUEOJEd2wkAbGL/5c7eUO01r20R3RS0calapsT6w2yV+ZEJZbYN0JQc1ZqcNHaJGg9h2a06LD1Ln3c9JimFNjHWpQ0Cz/tDsLx+knaGjSBb8N+319vZa395NUoBZ+WquQqj2QmGiAztFl1IMzfHBVO0XiAmdxLuNcb6Ah0FxnQv5lAWxSx3et485L/jhNQlEPILsSkcnVzdxKybBI/dCG9CrPiWVpwMsSa+xcmvfmYKC6Xfn6/li8Jd0qRhAheMGm2voYtmEHj7ii0C9iXSsHlakJ5C6OCzkNsVFDD3BNgt7p6zfalV6uCbLNOi0LZP+cvL7MP87CmqVUbsDDV2w3EDOUIGMc7G0shCVyCAYxyYEjV+qTB/eg2jPeaWvDAeds9lCim/5YgN6Ul6GO3U4= Content-Type: text/plain; charset="utf-8" Content-ID: <51017A5837F88B4C9B114849454B92EF@namprd15.prod.outlook.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: a096a053-f78d-478a-57f1-08d6f85425db X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jun 2019 03:29:21.9184 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ast@fb.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2248 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-24_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=967 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906240027 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gNi8yMy8xOSA3OjMwIFBNLCBSb21hbiBHdXNoY2hpbiB3cm90ZToNCj4gU2luY2UgY29tbWl0 IDRiZmMwYmIyYzYwZSAoImJwZjogZGVjb3VwbGUgdGhlIGxpZmV0aW1lIG9mIGNncm91cF9icGYN Cj4gZnJvbSBjZ3JvdXAgaXRzZWxmIiksIGNncm91cF9icGYgcmVsZWFzZSBvY2N1cnMgYXN5bmNo cm9ub3VzbHkNCj4gKGZyb20gYSB3b3JrZXIgY29udGV4dCksIGFuZCBiZWZvcmUgdGhlIHJlbGVh c2Ugb2YgdGhlIGNncm91cCBpdHNlbGYuDQo+IA0KPiBUaGlzIGludHJvZHVjZWQgYSBwcmV2aW91 c2x5IG5vbi1leGlzdGluZyByYWNlIGJldHdlZW4gdGhlIHJlbGVhc2UNCj4gYW5kIHVwZGF0ZSBw YXRocy4gRS5nLiBpZiBhIGxlYWYncyBjZ3JvdXBfYnBmIGlzIHJlbGVhc2VkIGFuZCBhIG5ldw0K PiBicGYgcHJvZ3JhbSBpcyBhdHRhY2hlZCB0byB0aGUgb25lIG9mIGFuY2VzdG9yIGNncm91cHMg YXQgdGhlIHNhbWUNCj4gdGltZS4gVGhlIHJhY2UgbWF5IHJlc3VsdCBpbiBkb3VibGUtZnJlZSBh bmQgb3RoZXIgbWVtb3J5IGNvcnJ1cHRpb25zLg0KPiANCj4gVG8gZml4IHRoZSBwcm9ibGVtLCBs ZXQncyBwcm90ZWN0IHRoZSBib2R5IG9mIGNncm91cF9icGZfcmVsZWFzZSgpDQo+IHdpdGggY2dy b3VwX211dGV4LCBhcyBpdCB3YXMgZWZmZWN0aXZlbHkgcHJldmlvdXNseSwgd2hlbiBhbGwgdGhp cw0KPiBjb2RlIHdhcyBjYWxsZWQgZnJvbSB0aGUgY2dyb3VwIHJlbGVhc2UgcGF0aCB3aXRoIGNn cm91cCBtdXRleCBoZWxkLg0KPiANCj4gQWxzbyBtYWtlIHN1cmUsIHRoYXQgd2UgZG9uJ3QgbGVh dmUgYWxyZWFkeSBmcmVlZCBwb2ludGVycyB0byB0aGUNCj4gZWZmZWN0aXZlIHByb2cgYXJyYXlz LiBPdGhlcndpc2UsIHRoZXkgY2FuIGJlIHJlbGVhc2VkIGFnYWluIGJ5DQo+IHRoZSB1cGRhdGUg cGF0aC4gSXQgd2Fzbid0IG5lY2Vzc2FyeSBiZWZvcmUsIGJlY2F1c2UgcHJldmlvdXNseQ0KPiB0 aGUgdXBkYXRlIHBhdGggY291bGRuJ3Qgc2VlIHN1Y2ggYSBjZ3JvdXAsIGFzIGNncm91cF9icGYg YW5kIGNncm91cA0KPiBpdHNlbGYgd2VyZSByZWxlYXNlZCB0b2dldGhlci4NCg0KSSB0aG91Z2h0 IGR5aW5nIGNncm91cCB3b24ndCBoYXZlIGFueSBjaGlsZHJlbiBjZ3JvdXBzID8NCkl0IHNob3Vs ZCBoYXZlIGJlZW4gZW1wdHkgd2l0aCBubyB0YXNrcyBpbnNpZGUgaXQ/DQpPbmx5IHNvbWUgcmVz b3VyY2VzIGFyZSBzdGlsbCBoZWxkPw0KbXV0ZXggYW5kIHplcm8gaW5pdCBhcmUgaGlnaGx5IHN1 c3BpY2lvdXMuDQpJdCBmZWVscyB0aGF0IGNncm91cF9icGZfcmVsZWFzZSBpcyBjYWxsZWQgdG9v IGVhcmx5Lg0KDQpUaGlua2luZyBmcm9tIGFub3RoZXIgYW5nbGUuLi4gaWYgY2hpbGQgY2dyb3Vw cyBjYW4gc3RpbGwgYXR0YWNoIHRoZW4NCnRoaXMgYnBmX3JlbGVhc2UgaXMgYnJva2VuLiBUaGUg Y29kZSBzaG91bGQgYmUNCmNhbGxpbmcgX19jZ3JvdXBfYnBmX2RldGFjaCgpIG9uZSBieSBvbmUg dG8gbWFrZSBzdXJlDQp1cGRhdGVfZWZmZWN0aXZlX3Byb2dzKCkgaXMgY2FsbGVkLCBzaW5jZSBk ZXNjZW5kYW50IGFyZSBzdGlsbA0Kc29ydC1vZiBhbGl2ZSBhbmQgY2FuIGF0dGFjaD8NCg0KTXkg bW9uZXkgaXMgb24gJ3RvbyBlYXJseScuDQpNYXkgYmUgY2dyb3VwIGlzIG5vdCBkeWluZyA/DQpK dXN0IGNncm91cF9za19mcmVlKCkgaXMgY2FsbGVkIG9uIHRoZSBsYXN0IHNvY2tldCBhbmQNCnRo aXMgYXV0by1kZXRhY2ggbG9naWMgZ290IHRyaWdnZXJlZCBpbmNvcnJlY3RseT8NCg==