From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBA7EC38145 for ; Tue, 6 Sep 2022 08:26:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234130AbiIFI0J (ORCPT ); Tue, 6 Sep 2022 04:26:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50396 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234099AbiIFI0I (ORCPT ); Tue, 6 Sep 2022 04:26:08 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65C923C8E9 for ; Tue, 6 Sep 2022 01:26:03 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-322-4VmOFDB4OwqP28iks9tnLA-1; Tue, 06 Sep 2022 09:26:01 +0100 X-MC-Unique: 4VmOFDB4OwqP28iks9tnLA-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Tue, 6 Sep 2022 09:25:59 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.040; Tue, 6 Sep 2022 09:25:59 +0100 From: David Laight To: 'Alexey Dobriyan' CC: "netdev@vger.kernel.org" , "stable@vger.kernel.org" , Eric Dumazet , "viro@zeniv.linux.org.uk" , "akpm@linux-foundation.org" , "regressions@lists.linux.dev" Subject: RE: setns() affecting other threads in 5.10.132 and 6.0 Thread-Topic: setns() affecting other threads in 5.10.132 and 6.0 Thread-Index: AdjAZGr2bm2+BO9aR228APTLkn1hUgApqGgQAA6DpAAAIG7lAA== Date: Tue, 6 Sep 2022 08:25:59 +0000 Message-ID: <958649bb1d76442d8aa76067e0a3e0b6@AcuMS.aculab.com> References: In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org RnJvbTogQWxleGV5IERvYnJpeWFuDQo+IFNlbnQ6IDA1IFNlcHRlbWJlciAyMDIyIDE4OjMzDQo+ IA0KPiBPbiBNb24sIFNlcCAwNSwgMjAyMiBhdCAwOTo1NDozNEFNICswMDAwLCBEYXZpZCBMYWln aHQgd3JvdGU6DQo+ID4gNzA1NTE5NzcwNTcwOWM1OWI4YWI3N2U2YTVjN2Q0NmQ2MWVkZDk2ZQ0K PiA+IEF1dGhvcjogQWxleGV5IERvYnJpeWFuIDxhZG9icml5YW5AZ21haWwuY29tPg0KPiA+ICAg ICBDYzogQWwgVmlybyA8dmlyb0B6ZW5pdi5saW51eC5vcmcudWs+DQo+ID4gICAgIFNpZ25lZC1v ZmYtYnk6IEFuZHJldyBNb3J0b24gPGFrcG1AbGludXgtZm91bmRhdGlvbi5vcmc+DQo+ID4gYzZj NzVkZWRhODEzDQo+ID4gMWZkZTZmMjFkOTBmDQo+ID4NCj4gPiA+IC0tLS0tT3JpZ2luYWwgTWVz c2FnZS0tLS0tDQo+ID4gPiBGcm9tOiBEYXZpZCBMYWlnaHQgPERhdmlkLkxhaWdodEBBQ1VMQUIu Q09NPg0KPiA+ID4gU2VudDogMDQgU2VwdGVtYmVyIDIwMjIgMTU6MDUNCj4gPiA+DQo+ID4gPiBT b21ldGltZSBhZnRlciA1LjEwLjEwNSAoNS4xMC4xMzIgYW5kIDYuMCkgdGhlcmUgaXMgYSBjaGFu Z2UgdGhhdA0KPiA+ID4gbWFrZXMgc2V0bnMob3BlbigiL3Byb2MvMS9ucy9uZXQiKSkgaW4gdGhl IG1haW4gcHJvY2VzcyBjaGFuZ2UNCj4gPiA+IHRoZSBiZWhhdmlvdXIgb2Ygb3RoZXIgcHJvY2Vz cyB0aHJlYWRzLg0KPiANCj4gTm90IGFnYWluLi4uDQoNClRoZSBiaXNlY3Rpb24gZ2F2ZSBhIHdo YWNrLWEtbW9sZSBwYXRjaCA6LSkNCg0KPiA+ID4gSSBkb24ndCBrbm93IGhvdyBtdWNoIGlzIGJy b2tlbiwgYnV0IHRoZSBmb2xsb3dpbmcgZmFpbHMuDQo+ID4gPg0KPiA+ID4gQ3JlYXRlIGEgbmV0 d29yayBuYW1lc3BhY2UgKGVnICJ0ZXN0IikuDQo+ID4gPiBDcmVhdGUgYSAnYm9uZCcgaW50ZXJm YWNlIChlZyAidGVzdDAiKSBpbiB0aGUgbmFtZXNwYWNlLg0KPiA+ID4NCj4gPiA+IFRoZW4gL3By b2MvbmV0L2JvbmRpbmcvdGVzdDAgb25seSBleGlzdHMgaW5zaWRlIHRoZSBuYW1lc3BhY2UuDQo+ ID4gPg0KPiA+ID4gSG93ZXZlciBpZiB5b3UgcnVuIGEgcHJvZ3JhbSBpbiB0aGUgInRlc3QiIG5h bWVzcGFjZSB0aGF0IGRvZXM6DQo+ID4gPiAtIGNyZWF0ZSBhIHRocmVhZC4NCj4gPiA+IC0gY2hh bmdlIHRoZSBtYWluIHRocmVhZCB0byBpbiAiaW5pdCIgbmFtZXNwYWNlLg0KPiA+ID4gLSB0cnkg dG8gb3BlbiAvcHJvYy9uZXQvYm9uZGluZy90ZXN0MCBpbiB0aGUgdGhyZWFkLg0KPiA+ID4gdGhl biB0aGUgb3BlbiBmYWlscy4NCj4gPiA+DQo+ID4gPiBJIGRvbid0IGtub3cgaG93IG11Y2ggZWxz ZSBpcyBhZmZlY3RlZCBhbmQgaGF2ZW4ndCB0cmllZA0KPiA+ID4gdG8gYmlzZWN0IChJIGNhbid0 IGNyZWF0ZSBib25kcyBvbiBteSBub3JtYWwgdGVzdCBrZXJuZWwpLg0KPiA+DQo+ID4gSSd2ZSBu b3cgYmlzZWN0ZWQgaXQuDQo+ID4gUHJpb3IgdG8gY2hhbmdlIDcwNTUxOTc3MDU3MDljNTliOGFi NzdlNmE1YzdkNDZkNjFlZGQ5NmUNCj4gPiAgICAgcHJvYzogZml4IGRlbnRyeS9pbm9kZSBvdmVy aW5zdGFudGlhdGluZyB1bmRlciAvcHJvYy8ke3BpZH0vbmV0DQo+ID4gdGhlIHNldG5zKCkgaGFk IG5vIGVmZmVjdCBvZiBlaXRoZXIgdGhyZWFkLg0KPiA+IEFmdGVyd2FyZHMgYm90aCB0aHJlYWRz IHNlZSB0aGUgZW50cmllcyBpbiB0aGUgaW5pdCBuYW1lc3BhY2UuDQo+ID4NCj4gPiBIb3dldmVy IEkgdGhpbmsgdGhhdCBpbiA1LjEwLjEwNSB0aGUgc2V0bnMoKSBkaWQgYWZmZWN0DQo+ID4gdGhl IHRocmVhZCBpdCB3YXMgcnVuIGluLg0KPiA+IFRoYXQgbWlnaHQgYmUgdGhlIGJlaGF2aW91ciBi ZWZvcmUgYzZjNzVkZWRhODEzLg0KPiA+ICAgICBwcm9jOiBmaXggbG9va3VwIGluIC9wcm9jL25l dCBzdWJkaXJlY3RvcmllcyBhZnRlciBzZXRucygyKQ0KPiA+DQo+ID4gVGhlcmUgaXMgYWxzbyB0 aGUgZWFybGllciAxZmRlNmYyMWQ5MGYNCj4gPiAgICAgcHJvYzogZml4IC9wcm9jL25ldC8qIGFm dGVyIHNldG5zKDIpDQo+ID4NCj4gPiBGcm9tIHRoZSBjb21taXQgbWVzc2FnZXMgaXQgZG9lcyBs b29rIGFzIHRob3VnaCBzZXRucygpIHNob3VsZA0KPiA+IGNoYW5nZSB3aGF0IGlzIHNlZW4sIGJ1 dCBqdXN0IGZvciB0aGUgY3VycmVudCB0aHJlYWQuDQo+ID4gU28gaXQgaXMgY3VycmVudGx5IGJy b2tlbiAtIGFuZCBoYXMgYmVlbiBzaW5jZSA1LjE4LjAtcmM0DQo+ID4gYW5kIHdoaWNoZXZlciBz dGFibGUgYnJhbmNoZXMgdGhlIGNoYW5nZSB3YXMgYmFja3BvcnRlZCB0by4NCj4gPg0KPiA+IAlE YXZpZA0KPiA+DQo+ID4gPg0KPiA+ID4gVGhlIHRlc3QgcHJvZ3JhbSBiZWxvdyBzaG93cyB0aGUg cHJvYmxlbS4NCj4gPiA+IENvbXBpbGUgYW5kIHJ1biBhczoNCj4gPiA+ICMgaXAgbmV0bnMgZXhl YyB0ZXN0IHN0cmFjZSAtZiB0ZXN0X3Byb2cgL3Byb2MvbmV0L2JvbmRpbmcvdGVzdDANCj4gPiA+ DQo+ID4gPiBUaGUgc2Vjb25kIG9wZW4gYnkgdGhlIGNoaWxkIHNob3VsZCBzdWNjZWVkLCBidXQg ZmFpbHMuDQo+ID4gPg0KPiA+ID4gSSBjYW4ndCBzZWUgYW55IGNoYW5nZXMgdG8gdGhlIGJvbmRp bmcgY29kZSwgc28gSSBzdXNwZWN0DQo+ID4gPiBpdCBpcyBzb21ldGhpbmcgbXVjaCBtb3JlIGZ1 bmRhbWVudGFsLg0KPiA+ID4gSXQgbWlnaHQgb25seSBhZmZlY3QgL3Byb2MvbmV0LCBidXQgaXQg bWlnaHQgYWxzbyBhZmZlY3QNCj4gPiA+IHdoaWNoIG5hbWVzcGFjZSBzb2NrZXRzIGdldCBjcmVh dGVkIGluLg0KPiANCj4gSG93PyBzZXRucygyKSBhY3RzIG9uICJjdXJyZW50IiwgYW5kIHNvY2tl dHMgYXJlIGNyZWF0ZWQgZnJvbQ0KPiBjdXJyZW50LT5uc3Byb3h5LT5uZXRfbnM/DQoNCkkgd2Fz IHdvcnJpZWQgdGhhdCB0aGluZ3MgbWlnaHQgYmUgcmVhbGx5IGJhZGx5IGJyb2tlbi4NClRoZSBi aXNlY3Rpb24gaW1wbGllZCAvcHJvYy9uZXQgcmF0aGVyIHRoYW4gbmFtZXNwYWNlIHNldHVwIGl0 c2VsZi4NCg0KPiA+ID4gSUlSQyBscyAtbCAvcHJvYy9uL3Rhc2svKi9ucyBnaXZlcyB0aGUgY29y cmVjdCBuYW1lc3BhY2VzLg0KPiANCj4gPiA+DQo+ID4gPiAJRGF2aWQNCj4gPiA+DQo+ID4gPg0K PiA+ID4gI2RlZmluZSBfR05VX1NPVVJDRQ0KPiA+ID4NCj4gPiA+ICNpbmNsdWRlIDxmY250bC5o Pg0KPiA+ID4gI2luY2x1ZGUgPHVuaXN0ZC5oPg0KPiA+ID4gI2luY2x1ZGUgPHBvbGwuaD4NCj4g PiA+ICNpbmNsdWRlIDxwdGhyZWFkLmg+DQo+ID4gPiAjaW5jbHVkZSA8c2NoZWQuaD4NCj4gPiA+ DQo+ID4gPiAjZGVmaW5lIGRlbGF5KHNlY3MpIHBvbGwoMCwwLCAoc2VjcykgKiAxMDAwKQ0KPiA+ ID4NCj4gPiA+IHN0YXRpYyB2b2lkICp0aHJlYWRfZm4odm9pZCAqZmlsZSkNCj4gPiA+IHsNCj4g PiA+ICAgICAgICAgZGVsYXkoMik7DQo+ID4gPiAgICAgICAgIG9wZW4oZmlsZSwgT19SRE9OTFkp Ow0KPiA+ID4NCj4gPiA+ICAgICAgICAgZGVsYXkoNSk7DQo+ID4gPiAgICAgICAgIG9wZW4oZmls ZSwgT19SRE9OTFkpOw0KPiA+ID4NCj4gPiA+ICAgICAgICAgcmV0dXJuIE5VTEw7DQo+ID4gPiB9 DQo+ID4gPg0KPiA+ID4gaW50IG1haW4oaW50IGFyZ2MsIGNoYXIgKiphcmd2KQ0KPiA+ID4gew0K PiA+ID4gICAgICAgICBwdGhyZWFkX3QgaWQ7DQo+ID4gPg0KPiA+ID4gICAgICAgICBwdGhyZWFk X2NyZWF0ZSgmaWQsIE5VTEwsIHRocmVhZF9mbiwgYXJndlsxXSk7DQo+ID4gPg0KPiA+ID4gICAg ICAgICBkZWxheSgxKTsNCj4gPiA+ICAgICAgICAgb3Blbihhcmd2WzFdLCBPX1JET05MWSk7DQo+ ID4gPg0KPiA+ID4gICAgICAgICBkZWxheSgyKTsNCj4gPiA+ICAgICAgICAgc2V0bnMob3Blbigi L3Byb2MvMS9ucy9uZXQiLCBPX1JET05MWSksIDApOw0KPiA+ID4NCj4gPiA+ICAgICAgICAgZGVs YXkoMSk7DQo+ID4gPiAgICAgICAgIG9wZW4oYXJndlsxXSwgT19SRE9OTFkpOw0KPiA+ID4NCj4g PiA+ICAgICAgICAgZGVsYXkoNCk7DQo+ID4gPg0KPiA+ID4gICAgICAgICByZXR1cm4gMDsNCj4g PiA+IH0NCj4gDQo+IENhbiB5b3UgdGVzdCBiZWZvcmUgdGhpcyBvbmU/IFRoaXMgaXMgd2hlcmUg aXQgYWxsIHN0YXJ0ZWQuDQo+IA0KPiAJY29tbWl0IDFkYTRkMzc3Zjk0M2ZlNDE5NGZmYjlmYjlj MjZjYzU4ZmFkNGRkMjQNCg0KVGhhdCBvbmUgcmVhbGx5IGRvZXNuJ3Qgd2FudCB0byBidWlsZCB3 aXRoIHRoZSB0b29sY2hhaW4gSSdtIHVzaW5nLg0KZ2NjIGdlbmVyYXRlcyBhIGxvdCBvZiB3YXJu aW5ncyAobW9zdGx5IGFib3V0IGZ1bmN0aW9uIHBvaW50ZXINCnR5cGVzKSBhbmQgdGhlbiBvYmp0 b29sIGZhaWxzIHRoZSBidWlsZC4NCg0KVGhlIGNoYW5nZXMgc2VlbSB0byBiZSBhYm91dCBmbHVz aGluZyB0aGUgZG5sYy4NCkluIG15IGNhc2UgZXZlcnl0aGluZyBpcyBwcmV0dHkgc3RhdGljLg0K VGhlIG5hbWVzcGFjZSBpcyBjcmVhdGVkIG9uY2UganVzdCBhZnRlciBib290Lg0KVGhlIHJlYWwg ZmFpbGluZyBwcm9ncmFtIGp1c3QgZG9lczoNCglpcCBuZXRucyBleGVjIG5hbWVzcGFjZSBwcm9n cmFtIDM8L3N5cy9jbGFzcy9uZXQNCglwcm9jZXNzOiBjbG9uZSgpDQoJcHJvY2Vzczogc2V0bnMo KQ0KCXRocmVhZDogb3BlbigiL3Byb2MvbmV0L2JvbmRpbmcvbm90X2luX25hbWVzcGFjZSIpDQph bmQgZXhwZWN0cyB0aGUgb3BlbigpIHRvIGZhaWwuDQpTbyBpdCBhY3R1YWxseSBsb29rcyBsaWtl IHRoZSB3cm9uZyBuYW1lc3BhY2UgaXMgYmVpbmcgdXNlZC4NCg0KSXQgaXMgaW50ZXJlc3Rpbmcg dGhhdCAvcHJvYy9uZXQgaXMgYWZmZWN0ZWQgYnkgc2V0bnMoKQ0Kd2hlcmVhcyB5b3UgaGF2ZSB0 byBnbyB0aHJvdWdoIGhvb3BzIHRvIGFjY2VzcyAvc3lzL2NsYXNzL25ldC4NCldlIHBhc3MgYW4g b3BlbiBmZCB0byAvc3lzL2NsYXNzL25ldCBpbiB0aGUgaW5pdCBuYW1lc3BhY2UNCnRocm91Z2gg dG8gdGhlIHByb2dyYW0gc28gaXQgY2FuIHVzZSBvcGVuYXQoMywgLi4uKSB0bw0Kc2VlIGVudHJp ZXMgaW4gYm90aCBuYW1lc3BhY2VzLg0KDQpUaGUgbmFtZXNwYWNlIGV4aXN0cyB0byBzZXBhcmF0 ZSBuZXR3b3JrIHRyYWZmaWMsIG5vdCBpc29sYXRlDQphcHBsaWNhdGlvbnMuDQoNCglEYXZpZA0K DQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFy bSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAo V2FsZXMpDQo=