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Wysocki" , LKML , "linux-pm@vger.kernel.org" , "lkp@lists.01.org" , "lkp@intel.com" , Damien Le Moal Subject: Re: [cpuidle,intel_idle] 32d4fd5751: WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit Thread-Topic: [cpuidle,intel_idle] 32d4fd5751: WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit Thread-Index: AQHYhvO8OeGtfqrIJkyBrsneRAjEHA== Date: Thu, 23 Jun 2022 11:23:59 +0000 Message-ID: <20220623112358.chwk2ld6k6sufeb5@shindev> References: <20220612160006.GB35020@xsang-OptiPlex-9020> In-Reply-To: <20220612160006.GB35020@xsang-OptiPlex-9020> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 17651eb2-8a24-4cb5-22d3-08da550ade8f x-ms-traffictypediagnostic: SN4PR0401MB3568:EE_ x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-ID: <08D4B58D6329A04B96D6B37758075BDC@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: 17651eb2-8a24-4cb5-22d3-08da550ade8f X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jun 2022 11:23:59.8147 (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: 9W1ttwfm19iWlwJnlnMvyWtHdpKKEjzZ2QU6bxHbr+5/8Vv12Odz2gXJEQt7TOh8xIDj1t4nutwVWd0ceAPd1qusjzEk1qBoPj/8OFvX8/c= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN4PR0401MB3568 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Jun 13, 2022 / 00:00, kernel test robot wrote: >=20 >=20 > Greeting, >=20 > FYI, we noticed the following commit (built with gcc-11): >=20 > commit: 32d4fd5751eadbe1823a37eb38df85ec5c8e6207 ("cpuidle,intel_idle: Fi= x CPUIDLE_FLAG_IRQ_ENABLE") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >=20 > in testcase: kernel-selftests > version: kernel-selftests-x86_64-cef46213-1_20220609 > with following parameters: >=20 > group: resctrl > ucode: 0x500320a >=20 > test-description: The kernel contains a set of "self tests" under the too= ls/testing/selftests/ directory. These are intended to be small unit tests = to exercise individual code paths in the kernel. > test-url: https://www.kernel.org/doc/Documentation/kselftest.txt >=20 >=20 > on test machine: 88 threads 2 sockets Intel(R) Xeon(R) Gold 6238M CPU @ 2= .10GHz with 128G memory >=20 > caused below changes (please refer to attached dmesg/kmsg for entire log/= backtrace): >=20 >=20 >=20 > If you fix the issue, kindly add following tag > Reported-by: kernel test robot >=20 >=20 > [ 29.104402][ T0] WARNING: CPU: 0 PID: 0 at kernel/rcu/tree.c:864 rcu_eqs= _exit+0x4b/0xc0=20 > [ 29.104417][ T0] > [ 29.104418][ T0] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > [ 29.104419][ T0] WARNING: suspicious RCU usage > [ 29.104421][ T0] 5.19.0-rc1-00001-g32d4fd5751ea #1 Not tainted > [ 29.104424][ T0] ----------------------------- FYI, I observe this WARNING on my test servers for fstests, with kernel v5.19-rc3. It was observed at system boot, and was also observed repeatedly during fstests run. I reverted the commit 32d4fd5751ea then the WARNING disappeared. The WARNING was observed on systems with 20 threads CPU, but not observed on systems with 8 threads CPU. Looking in the commit, I'm not sure how it is related to the RCU warning. If any further action on my system would help, please let me know. --=20 Shin'ichiro Kawasaki=