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Sun, 22 Aug 2021 16:25:19 +0000 From: David Mozes To: Wei Liu CC: David Moses , Michael Kelley , =?windows-1255?B?+uXu+CDg4eXo4eXs?= , "linux-hyperv@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others() Thread-Topic: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others() Thread-Index: AQHXiqRBXwjgsSgsKkyKw+PnE9iSIKtmSmoAgABuwJCAAAw8gIAAP8SAgAB3w4CAD/sBMIAAKS8AgAApdACAArr58IAFOM4AgAAOnZA= Date: Sun, 22 Aug 2021 16:25:19 +0000 Message-ID: References: <20210817112954.ufjd77ujq5nhmmew@liuwe-devbox-debian-v2> <20210822152436.mqfwv3xbqfxy33os@liuwe-devbox-debian-v2> In-Reply-To: <20210822152436.mqfwv3xbqfxy33os@liuwe-devbox-debian-v2> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=silk.us; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a2524fd5-b618-4da6-9a5b-08d965896ec6 x-ms-traffictypediagnostic: VI1PR04MB5407: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="windows-1255" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: silk.us X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI1PR0401MB2415.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a2524fd5-b618-4da6-9a5b-08d965896ec6 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Aug 2021 16:25:19.2030 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4a3c5477-cb0e-470b-aba6-13bd9debb76b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: vhqADd7SmYWJBvMO4cus07OF+HsW4XcqmTlVxw5I1T8qep/Dh4McuyRAvnsWy3jS20NxnBp6nDi01dSu2rmLgQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB5407 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org This is not visible since we need a very high load to reproduce.=20 We have tried a lot but can't achieve the desired load=20 On our kernel with less load, it is not reproducible as well. -----Original Message----- From: Wei Liu =20 Sent: Sunday, August 22, 2021 6:25 PM To: David Mozes Cc: David Moses ; Wei Liu ; Michae= l Kelley ; =FA=E5=EE=F8 =E0=E1=E5=E8=E1=E5=EC ; linux-hyperv@vger.kernel.org; linux-kernel@vger.kernel.= org Subject: Re: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_= flush_tlb_others() On Thu, Aug 19, 2021 at 07:55:06AM +0000, David Mozes wrote: > Hi Wei , > I move the print cpumask to other two places after the treatment on the e= mpty mask see below > And I got the folwing: >=20 >=20 > Aug 19 02:01:51 c-node05 kernel: [25936.562674] Hyper-V: ERROR_HYPERV2: c= pu_last=3D > Aug 19 02:01:51 c-node05 kernel: [25936.562686] WARNING: CPU: 11 PID: 564= 32 at arch/x86/include/asm/mshyperv.h:301 hyperv_flush_tlb_others+0x23f/0x7= b0 >=20 > So we got empty on different place on the code . > Let me know if you need further information from us. > How you sagest to handle this situation? >=20 Please find a way to reproduce this issue with upstream kernels. Thanks, Wei.