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charset="us-ascii" Content-ID: <15EBD8D63959A849AB91EE5D3D2AA7F3@namprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Exchange-RoutingPolicyChecked: ko8UZSy1C3x4mhvDE3GwG3BRV28rpndPNLQUPHgDcSwhlrsjCwB0J3saTLDneAS9TvtWVSYeQn90pbK3ji1mnIPVMH9AJE9kZE7+d66v4UPcypAN59nuDW9Ah7zbJkb7pstOKbc3DrVOHt+EhRD1pXms0JDDdQYuz1SL94gUMsHUCdjrYxMdNe/vzv/xXRCpA358gicjHBXKA/tnDR5KqKhGCgeuzM+Cr3in0jOyf4xc5mQMJGy8iB2buEGU4kD/M0MrfZbP8f0rBWJimCKephxu6SJ5bHxvWvnFEj6lH6hbcaLSrXs/k3SxW2bITd/xV19Mgx5FPcNHj6XLnjvcxA== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN7PR04MB8532.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 62b3db58-6864-4bcb-efbe-08de7c33c185 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Mar 2026 10:24:46.4600 (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: NkvRKQBu1rGnLSRq5j4VkZA1XZDSTI2fVwM+tP/EOHRKcyaOAccx0aLjGTue1oXJdff8tdMpQxEyznG+6DqZl2nTnrOdnzOno/54FR7yeso= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR04MB7600 On Mar 06, 2026 / 14:14, Daniel Wagner wrote: > On Fri, Mar 06, 2026 at 12:27:51PM +0000, Shinichiro Kawasaki wrote: > > On Mar 05, 2026 / 16:01, Daniel Wagner wrote: > > > Add test case from Stephen Zhang [1][2], which is > > >=20 > > > 1. Wait for fio to complete (wait $fio_pid) > > > 2. Wait a few seconds for I/O to drain > > > 3. Then check the utilization > > >=20 > > > If utilization is still > 0% after I/O completes, then there's a real > > > accounting leak. > > >=20 > > > [1] https://lore.kernel.org/linux-bcache/CANubcdX7eNbH_bo4-f94DUbdiEb= t04Vxy1MPyhm+CZyXB01FuQ@mail.gmail.com/ > > > [2] https://lore.kernel.org/all/CANubcdU92Uv7wNdZH357LLTnfwPouekXNTPS= jHnzYzK99-eZ9w@mail.gmail.com > >=20 > > Thanks for the updates. It's good that we do not need iostat :) > >=20 > > I ran this test case with v7.0-rc2 kernel, and it passes. Good. > >=20 > > I also ran this test case with older kernel without the kernel fix [1].= I > > expected failure, but it passed. I ran the Stephen's original test scri= pt and it > > did not fail either. So I guess my test environment does not fulfill th= e > > conditions to recreate the failure. Daniel, did you observe this test c= ase > > failed with any older kernel? >=20 > Same here, it doesn't fail on older kernels either. Maybe we should just > not merge this test then? Maybe Stephen can have a look and figure out > what needs to be done to trigger the condition more reliable. I see. Before merging this patch, I would like to make sure that this test = case is valuable, and it does not just waste time and power of CI systems. Stephen, May I ask you to share what kind of devices you used to recreate the failur= e? Also, could you share the kernel .config to recreate the failure? I would l= ike use them to recreate the failure on my test system. >=20 > > Let me leave nit comments in line. If this patch does not respin, I can= fold in > > the changes for the nit comments. >=20 > Sure, just fix it up if you decide to apply it. Got it, thanks.=