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:   Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
To:     "yangx.jy@fujitsu.com" <yangx.jy@fujitsu.com>
CC:     "hch@infradead.org" <hch@infradead.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tejun Heo <tj@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Leon Romanovsky <leon@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: [bug report from blktests nvme/032] WARNING: possible circular
 locking dependency detected
Thread-Topic: [bug report from blktests nvme/032] WARNING: possible circular
 locking dependency detected
Thread-Index: AQHYkAjmw6XcqQ1UdE+2h2wJPET+mK2FB/kAgAArzAA=
Date:   Tue, 19 Jul 2022 04:42:17 +0000
Message-ID: <20220719044216.p55474yfbwra2p5v@shindev>
References: <4ed3028b-2d2f-8755-fec2-0b9cb5ad42d2@fujitsu.com>
 <YrqauCHdcieF5+C7@kroah.com> <YrqbNfF9uYMSwZ4V@infradead.org>
 <Yrqb47ozk5IWTnWp@kroah.com> <YrqdUpLVbLF7WNGs@infradead.org>
 <20220705004809.6guf43xwjpq33smo@shindev>
 <33e90f37-c201-9ac6-f65e-3646341dcc2c@fujitsu.com>
In-Reply-To: <33e90f37-c201-9ac6-f65e-3646341dcc2c@fujitsu.com>
Accept-Language: en-US
Content-Language: en-US
wdcipoutbound: EOP-TRUE
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?kiGCvpogE9t5gzis08hwnjltViM4o7amDGZgb9dZaIF6qur4FhFlQeGBxogI?=
 =?us-ascii?Q?oY67LFpzoLtqNcNPX0ynNlVRL5pa16kfs22EtjVdXexY/dJr6MBSznU0SM/h?=
 =?us-ascii?Q?IlHILjVEcxO02x0noL7PLKU0wLILzqmyvLGfjW8zuAcKZzRz/2P1xYxc+ORK?=
 =?us-ascii?Q?TzrMWSLmNk5/qlHbTOa3u71CNZarnesWrigtBZW8g1ZLfCl/xlLiiNMiczlW?=
 =?us-ascii?Q?lvpev6FJcrqbb7uBe6RA0N67v4YXI8N+2rmFs3OHN3oYwg97HRUaRb6Flw/f?=
 =?us-ascii?Q?aRje74CadIM/+wiwL5xiCeYE4PAV8BVESFuqtee1zGDOryRGqlmR/ro//umM?=
 =?us-ascii?Q?6iCn4qGylU8362NZ6AgvDOyifPc7RWW0lnqGs44anvydukbkD8WmSf/tgEK0?=
 =?us-ascii?Q?VG4zZVI4f+eVl4KPhHOZu7sdUaJapf737rMXVGC5BSbOJ8N5tmq6MvXMYlZ0?=
 =?us-ascii?Q?WjFhtkc9oA/pyphyfci4RFhXJzjQA4Jioq+hnffaIxznZdJm0NN6w/Y2A3kI?=
 =?us-ascii?Q?7n+0VNPiKlHyHVWKpmFqyztJaAABZ2PanraDMCMYOp0h5LRpgyu/CIWrb/No?=
 =?us-ascii?Q?bD7Uss6vXHHiEYGIlpSzWMqn6Z2m0yGyYtN7vDFHrXFusgjUavmvFawqjU3e?=
 =?us-ascii?Q?Z+PsSEppMfkqtZ0gaa+cqICHYVCFqvIOT1TfIjGRASI7dJjZiUSniMLNEZBo?=
 =?us-ascii?Q?7PUwcd1aUxwR1zTzX5+jAArsXIGRRa1qq9rkwxbXax0P6EaAmaqR8v9y8LY2?=
 =?us-ascii?Q?xAnl21K0PHLYGIwyAc2h6mQefkMSt4yc59NRShLq0DCJB1DQf9ynHWdofsOd?=
 =?us-ascii?Q?liNsbpOXRtJHKlF93vFtmjbJO0topzxef2MyGI4hozIjbEKBtbCAmJaGaDSH?=
 =?us-ascii?Q?uHg8SwoWZdmqYPeBpNKmvrfTdypcEL7GFS1NALCCfzYpupNB7HjuIplqQAqh?=
 =?us-ascii?Q?mpQVVpfBYnWjd524ALv9+FWgBMhMQvLycSyRqp6JGJJ5qJVDkjOcgBBrjFIB?=
 =?us-ascii?Q?9NQn5nA6D8Ke5+erFWJrjE0IsTwTu6U4JNExm2nyaMP8co9Zo1zd4WnagtpD?=
 =?us-ascii?Q?lYcdpP/MKrb0L9aHwjBB8aOaQVCeN2WmJOZ9xnvLul+Ez9oi+T/NQfIrXA+k?=
 =?us-ascii?Q?JZ5rhuJAt+dyxGt0Hrh54rQf3VsnPbAfWK1LRbUMQ64d0G8AA7Yhl5jOnTCk?=
 =?us-ascii?Q?+9rZkM5629gkDedLOKa7Ya9ldntPW4c3VmjUxgInApFi+btVC+amQfTrIa4q?=
 =?us-ascii?Q?nfPe8L7b03wsEfJPxNZP921IlYpVTTQfQWfWWgMICFK/5t4jdVm2f4XsLwXV?=
 =?us-ascii?Q?XJJgZ2IkAN/wEcD+osrhIhV+AXMAcRAJuEBlR+nqiB7Kkj8ez7HMzBIcMqMc?=
 =?us-ascii?Q?tPoQQsI/FdtBtfChPImmLFJpYq/w4Y4rIYMjZkcZkjKJSXIbde7sd/7c2JCU?=
 =?us-ascii?Q?L6YdA+B5MhNhO+2lnn9pIT34HXXjXPlwi/OfdgTUn1As92ezgTztNQTlwb4S?=
 =?us-ascii?Q?/JH97mkmoP4gt9NO/nM1yj/g3Gm8s46ifxTnCr8dkk8wlVzPlunv3CIrillk?=
 =?us-ascii?Q?mlcd2BIBFASAJ1XXyJsAoBdKKkMc0g6ahIPRDUw4Cf2swOebej6bydFeHu+Y?=
 =?us-ascii?Q?QtEIu9H+UmH92b/ngDU08VY=3D?=
Content-Type: text/plain; charset="us-ascii"
Content-ID: <0FE87EF953BC514DB3B465F524C8B49F@namprd04.prod.outlook.com>
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-OriginatorOrg: wdc.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: DM8PR04MB8037.namprd04.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 60f677b4-4dc7-4f2b-c1ab-08da69410f04
X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Jul 2022 04:42:17.1638
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: VNd81DEVZo2+td+zCixSpzTpuLLKeK2XDGxYBHEj6Xuf3lTmZTcD74Yno2okWnOJdre2fgpleNND5L9gx0hBuKt/k9hLMY8FMVeRQsiCr+Y=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB6768
X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_PASS,
        SPF_NONE autolearn=ham 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 Jul 19, 2022 / 02:05, yangx.jy@fujitsu.com wrote:
> On 2022/7/5 8:48, Shinichiro Kawasaki wrote:
> > On Jun 27, 2022 / 23:18, Christoph Hellwig wrote:
> >> On Tue, Jun 28, 2022 at 08:12:51AM +0200, Greg Kroah-Hartman wrote:
> >>> Ah, so it's a fake PCI device, or is it a real one?
> >>
> >> Whatever the blktests configuration points to.  But even if it is
> >> "fake" that fake would come from the hypervisor.
> >=20
> > FYI, the WARN was observed with real PCI NVMe device also. I observed t=
he WARN
> > with v5.19-rc1 and still observe with v5.19-rc5. I'm not sure which ver=
sion
> > introduced the WARN.
> >=20
> > I once reported this failure, and shared with linux-pci list.
> >=20
> > https://lore.kernel.org/linux-block/20220614010907.bvbrgbz7nnvpnw5w@shi=
ndev/
> >=20
>=20
> Hi Shinichiro,
>=20
> I wonder if the failure has been fixed? If so, could you tell me the fix=
=20
> patch?

No, I'm not aware of fix for the failure yet. At v5.19-rc6, I still observe=
 the
failure.

--=20
Shin'ichiro Kawasaki=