Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   "Akira Naribayashi (Fujitsu)" <a.naribayashi@fujitsu.com>
To:     'Mel Gorman' <mgorman@techsingularity.net>
CC:     "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "vbabka@suse.cz" <vbabka@suse.cz>,
        "rientjes@google.com" <rientjes@google.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "Akira Naribayashi (Fujitsu)" <a.naribayashi@fujitsu.com>
Subject: RE: [PATCH] mm, compaction: fix fast_isolate_around() to stay within
 boundaries
Thread-Topic: [PATCH] mm, compaction: fix fast_isolate_around() to stay within
 boundaries
Thread-Index: AQHY6S3O4xnDu8L77EevMVig1gEQ/64iskiAgAVyM4CAC1JoQIAANjcAgAE2EwA=
Date:   Wed, 9 Nov 2022 05:41:12 +0000
Message-ID: <TYCPR01MB7775D957483C895456CFE146E53E9@TYCPR01MB7775.jpnprd01.prod.outlook.com>
References: <20221027132557.5f724149bd5753036f41512a@linux-foundation.org>
 <20221031073559.36021-1-a.naribayashi@fujitsu.com>
 <TYCPR01MB77752C15C512BB7EC952F05BE53C9@TYCPR01MB7775.jpnprd01.prod.outlook.com>
 <20221107154350.34brdl3ms2ve5wud@techsingularity.net>
In-Reply-To: <20221107154350.34brdl3ms2ve5wud@techsingularity.net>
Accept-Language: ja-JP, en-US
Content-Language: ja-JP
msip_labels: =?iso-2022-jp?B?TVNJUF9MYWJlbF9hNzI5NWNjMS1kMjc5LTQyYWMtYWI0ZC0zYjBmNGZl?=
 =?iso-2022-jp?B?Y2UwNTBfQWN0aW9uSWQ9N2JjYjczYzEtOTkwZS00ZTI3LTg5Y2ItZjE4?=
 =?iso-2022-jp?B?YzkyM2U0N2FlO01TSVBfTGFiZWxfYTcyOTVjYzEtZDI3OS00MmFjLWFi?=
 =?iso-2022-jp?B?NGQtM2IwZjRmZWNlMDUwX0NvbnRlbnRCaXRzPTA7TVNJUF9MYWJlbF9h?=
 =?iso-2022-jp?B?NzI5NWNjMS1kMjc5LTQyYWMtYWI0ZC0zYjBmNGZlY2UwNTBfRW5hYmxl?=
 =?iso-2022-jp?B?ZD10cnVlO01TSVBfTGFiZWxfYTcyOTVjYzEtZDI3OS00MmFjLWFiNGQt?=
 =?iso-2022-jp?B?M2IwZjRmZWNlMDUwX01ldGhvZD1TdGFuZGFyZDtNU0lQX0xhYmVsX2E3?=
 =?iso-2022-jp?B?Mjk1Y2MxLWQyNzktNDJhYy1hYjRkLTNiMGY0ZmVjZTA1MF9OYW1lPUZV?=
 =?iso-2022-jp?B?SklUU1UtUkVTVFJJQ1RFRBskQiJMJT8lUhsoQjtNU0lQX0xhYmVsX2E3?=
 =?iso-2022-jp?B?Mjk1Y2MxLWQyNzktNDJhYy1hYjRkLTNiMGY0ZmVjZTA1MF9TZXREYXRl?=
 =?iso-2022-jp?B?PTIwMjItMTEtMDhUMTA6MTM6MzdaO01TSVBfTGFiZWxfYTcyOTVjYzEt?=
 =?iso-2022-jp?B?ZDI3OS00MmFjLWFiNGQtM2IwZjRmZWNlMDUwX1NpdGVJZD1hMTlmMTIx?=
 =?iso-2022-jp?B?ZC04MWUxLTQ4NTgtYTlkOC03MzZlMjY3ZmQ0Yzc7?=
authentication-results: dkim=none (message not signed)
 header.d=none;dmarc=none action=none header.from=fujitsu.com;
x-ms-publictraffictype: Email
x-ms-traffictypediagnostic: TYCPR01MB7775:EE_|TYYPR01MB10592:EE_
x-ms-office365-filtering-correlation-id: 563c23bf-e487-44b6-0658-08dac21502ff
x-ms-exchange-senderadcheck: 1
x-ms-exchange-antispam-relay: 0
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:TYCPR01MB7775.jpnprd01.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(346002)(396003)(366004)(376002)(136003)(39860400002)(451199015)(1590799012)(107886003)(478600001)(26005)(7696005)(9686003)(6506007)(2906002)(83380400001)(55016003)(5660300002)(33656002)(86362001)(38070700005)(52536014)(82960400001)(38100700002)(1580799009)(122000001)(6916009)(64756008)(186003)(316002)(41300700001)(85182001)(71200400001)(54906003)(8936002)(66446008)(76116006)(66556008)(66476007)(4326008)(66946007)(8676002);DIR:OUT;SFP:1101;
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?iso-2022-jp?B?UEtKdjRQYURBSEZjL0FTNk1PcVo5OGoxN0FEK0pYZTJKaEs5d0U0OG90?=
 =?iso-2022-jp?B?dzUwMmFKcGVFTFZib0tldUhMTEdTZU8rKzhteVZSOUoxSzVWVDdGUHJ4?=
 =?iso-2022-jp?B?MTR2eXFvbE12dFd1QlNZMG5VNXk0YjJRejdxRDNmY0VSQml3bmUybFBw?=
 =?iso-2022-jp?B?WjgrTW9MWUVFVGQxdkVMb3ExNDI4SCtCWm0zdkwwMUx0ekpqK3JQYkpq?=
 =?iso-2022-jp?B?dDNjMFJwVlkxaGEvemhjTlpBSFpUMjFadi9IK0JmeEhqM0tOc1Q1Z2Nq?=
 =?iso-2022-jp?B?Qm1VelAycEVhbGFtdFQ5OUk1aVVzclYxbFphajkxVHJBdURYZUx1aGQw?=
 =?iso-2022-jp?B?Z0FjM2N1WGtJRXNydE1ORkN3Nms0Mlc4U2dEcnZNL1Bwc3NFOUtFeDcy?=
 =?iso-2022-jp?B?eERtREF2dnZ1V2ZJMVFQZGVsKzRjYlNWbjRKMEI4aVhTVGJCamVtcGlO?=
 =?iso-2022-jp?B?Nml1NnR4a21nL1k4YUNOZ0pMbytTWnhRMENDUXlVSittQ1dXRUxvM2d6?=
 =?iso-2022-jp?B?TENzQnhKV1NRTHlHUTRzRW5MM0FsbURHSktxekVZUnZpSy81RXUrbnh6?=
 =?iso-2022-jp?B?TTRvZ29CSS9oc2RrM2pneWRJVWErQkt1SnpYNEVxdnpwUkF6Q3E0cCtK?=
 =?iso-2022-jp?B?d2Vqb0Y5QmtkMG93Snd6MkUwc0pldUwzYngrVEhZamJYbUtMclBwTStt?=
 =?iso-2022-jp?B?b1hzUGJzcldmUnkyQTBvZGJCNGhhdytLRlZIMms2UkZlMlpGbVlVeTh0?=
 =?iso-2022-jp?B?V1lTYnMxQWxuWjB4dGRtQ0JGMEdvWW5sL3l4bWtpZHRGazJrMFFYM2VZ?=
 =?iso-2022-jp?B?cVpqb1FnanJjVDZobkVocFVBSDdTOVV5NW9JT1JvN2s2a2ZrL0VGb2RT?=
 =?iso-2022-jp?B?VDg5TjVwZDVVa0U4NXNUTm1ScHhCMVo4UFZzSC84aUhxR21ybWl2K2Mr?=
 =?iso-2022-jp?B?ejBiOWMwdW1FYnZKZlJuZTVMOGo5YzBxMWRMVVc4T2tZWmZsZzFMeGVl?=
 =?iso-2022-jp?B?bEtHYWhOYzk3VUxzb1k4ZWhveFRiSllUUXl3Zkppc3lNd3N0Lzg4Sndx?=
 =?iso-2022-jp?B?Tm9EZnFFN3JpSHlUYWpsWHB4cFRTUTlPcVhSdktCeUUzbCs4YWhIbzVw?=
 =?iso-2022-jp?B?NWthbmFnVElPTDZWdE5ucXJVcEEvZ0VsQkZvQXVPY1BKanBFem5VTVRj?=
 =?iso-2022-jp?B?dW40bEFhMmswbUcvNmpabW1JZGhMM1BtQVJrQSttSFF4dUpZVmlzNWxn?=
 =?iso-2022-jp?B?YTVENVRXaFZWckJOZjN3Q1YxVFZqRjE2N2dEVE5aZmdvZ0tJbjZHYlow?=
 =?iso-2022-jp?B?MWVuVi9WUGRyWU1tYU0yR0lQY3BBQ2JGODUvVkpReGxDVTg3U1pnUWs1?=
 =?iso-2022-jp?B?RUIwYnhDVkZxeHBJY0NIcWZnMlVhQWVmL1A0SkJvV1JYQzVaNmduL0lq?=
 =?iso-2022-jp?B?ZWJBUUc2VXNIcU9heXF2WTBPS2J3V3FqOFRoQ2ZGZ2ZYbXROWUI2aTRa?=
 =?iso-2022-jp?B?YTZIcW83V2JmVVZiZzhydVhTdTFrTThpNDlUQVhiWGV1d1VDWXZhMm9C?=
 =?iso-2022-jp?B?TVJnVGFaSEhONm1adG0vYWJPSk40cC9DRFRXQ042eWN3QVJFTjBnN0lo?=
 =?iso-2022-jp?B?VmJLdEEvbEptWFFvMUd6am9DUkpFMFNJaXJDWFN2OGhLMUl1bStKZmVW?=
 =?iso-2022-jp?B?SFFNSTBFYThOZ29iTzFLWGl4TmdOejI1cW1wWUhQVkNUK1JSamFFVVdz?=
 =?iso-2022-jp?B?aDEvUUo5ckROZ0llSU9NQkhML0ZJTGZBbXJVWGRLcFBrRW5EMkNtb1cw?=
 =?iso-2022-jp?B?ejQrOHJ2aVdOY01IMU1wS3cxU29zVlBsQkJUQVg4SC81ZVpLNkppYjJZ?=
 =?iso-2022-jp?B?U016TkFKT0RhY1BqTjAzLzJUVkIzZnhMeGRTQlB5RTdHbXI3cFh3YURs?=
 =?iso-2022-jp?B?dXhyWHVVUHRmRzQrWFhDRVA4aDFoMXpxVHJzNDN3Z3VYYlZFeU9WN25l?=
 =?iso-2022-jp?B?K3I2NTkzbEZPVGlWRGduWGRwUWV5NWxYWElhS3NJQ0o4eFJ1RGhIWGI3?=
 =?iso-2022-jp?B?aVpLaDdkK2Z6dDRDRlZDNDB5alM4Y2dwNVpGQkVkZWZ0cHhMMVovdm5N?=
 =?iso-2022-jp?B?MlVBbDlOT2NGblM0TjE5dVdhMW9YYWlHS2lQL2tlaDBkRlRJd1hLYXNv?=
 =?iso-2022-jp?B?bXZuVlRLVXU5aUxLdFEwWmNWRWxtTHk3dmJ3TUdwL2t1V1JYT3VTVy81?=
 =?iso-2022-jp?B?b09WbzB3bFB4Skh6dW1MUzI0bWVWd1N2MFFpNWVZVXFDU1RvdW9jUzFt?=
 =?iso-2022-jp?B?L3BqckI1VjkyWFRURXZhYU1sYXJPK084S1E9PQ==?=
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-OriginatorOrg: fujitsu.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: TYCPR01MB7775.jpnprd01.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 563c23bf-e487-44b6-0658-08dac21502ff
X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Nov 2022 05:41:12.6559
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: r8VN2iOHfciwiGNTWOErtvx+44Dxak38fGIcwe0nqu0xjaqJlsa8OidOMbMqJA6fKmIevFX6Y+Pax+r91NwbW5sro6wRnoQIHr0CQlDcwEo=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYYPR01MB10592
X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIM_INVALID,
        DKIM_SIGNED,SPF_HELO_PASS,SPF_NONE autolearn=no autolearn_force=no
        version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, 7 Nov 2022 15:43:56 +0000, Mei Gorman wrote:
> On Mon, Nov 07, 2022 at 12:32:34PM +0000, Akira Naribayashi (Fujitsu) wro=
te:
> > > Under what circumstances will this panic occur?  I assume those
> > > circumstnces are pretty rare, give that 6e2b7044c1992 was nearly two
> > > years ago.
> > >=20
> > > Did you consider the desirability of backporting this fix into earlie=
r
> > > kernels?
> >=20
> >=20
> > Panic can occur on systems with multiple zones in a single pageblock.
> >=20
>=20
> Please provide an example of the panic and the zoneinfo.

This issue is occurring in our customer's environment and cannot=20
be shared publicly as it contains customer information.
Also, the panic is occurring with the kernel in RHEL and may not=20
panic with Upstream's community kernel.
In other words, it is possible to panic on older kernels.
I think this fix should be backported to stable kernel series.

> > The reason it is rare is that it only happens in special configurations=
.
>=20
> How is this special configuration created?

This is the case when the node boundary is not aligned to pageblock boundar=
y.