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Tue, 3 Dec 2024 00:03:01 +0000 Message-ID: <643cfdaa-b43b-f445-f7aa-cc444797368d@intel.com> Date: Mon, 2 Dec 2024 16:03:18 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Thunderbird/91.11.0 Subject: Re: resctrl mount fail on v6.13-rc1 Content-Language: en-US To: "Luck, Tony" , Reinette Chatre CC: Peter Newman , Babu Moger , References: <868b451a-fdba-4b45-bff1-9ac1023080c8@intel.com> From: Fenghua Yu In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR01CA0024.prod.exchangelabs.com (2603:10b6:a02:80::37) To IA1PR11MB6097.namprd11.prod.outlook.com (2603:10b6:208:3d7::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB6097:EE_|MN2PR11MB4695:EE_ X-MS-Office365-Filtering-Correlation-Id: 98178c07-aa1a-4616-419d-08dd132dda1c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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Or the way resctrl uses kernfs? >> >> I am not seeing this but that may be because I am not testing with >> selinux enabled. My test kernel has: >> # CONFIG_SECURITY_SELINUX is not set > > I did have SELINUX configured. Disabling this CONFIG option > makes the lockdep splat go away. >> >> I am also not running with any btrfs filesystems. > > My root and home filesystems are btrfs, so difficult to > check if this is also connected. >> >> Is this your usual setup in which you are seeing this the first time? Is it >> perhaps possible for you to bisect? >> >> The subject states "resctrl mount fail" - could you please confirm if >> resctrl cannot be mounted in addition to the lockdep warning? > > The filesystem did get mounted despite all the lockdep noise. > >> >> Reinette > > -Tony I did see a similar warning on ksoftirqd before mount resctrl during boot time: [ 65.611812] WARNING: possible circular locking dependency detected [ 65.611813] 6.13.0-rc1-dsa+ #62 Not tainted [ 65.611814] ------------------------------------------------------ [ 65.611815] ksoftirqd/4/44 is trying to acquire lock: [ 65.611817] ffffffffa787fbb8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0x13/0x40 [ 65.611829] but task is already holding lock: [ 65.611830] ff4ed95eefb32898 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x27/0x40 [ 65.643035] which lock already depends on the new lock. But I did not see the locking warning when mount resctrl. I don't use brtfs. Thanks. -Fenghua