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Wed, 4 Dec 2024 16:48:16 +0000 Message-ID: <95e33677-66e7-458d-937d-e1b5842666d3@intel.com> Date: Wed, 4 Dec 2024 08:48:14 -0800 User-Agent: Mozilla Thunderbird Subject: Re: resctrl mount fail on v6.13-rc1 To: Ming Lei CC: "Luck, Tony" , Fenghua Yu , Peter Newman , Babu Moger , , Borislav Petkov , "x86@kernel.org" References: <868b451a-fdba-4b45-bff1-9ac1023080c8@intel.com> <542a0c87-935a-4b39-8210-22a7d46de6e5@intel.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P221CA0025.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::30) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|CY8PR11MB7828:EE_ X-MS-Office365-Filtering-Correlation-Id: 1dbc8a0a-707a-4332-b70f-08dd14837342 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|7053199007; 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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 am also not running with any btrfs filesystems. >>>>> >>>>> Is this your usual setup in which you are seeing this the first time? Is it >>>>> perhaps possible for you to bisect? >>>> >>>> Bisection says: >>>> >>>> $ git bisect bad >>>> f1be1788a32e8fa63416ad4518bbd1a85a825c9d is the first bad commit >>>> commit f1be1788a32e8fa63416ad4518bbd1a85a825c9d >>>> Author: Ming Lei >>>> Date: Fri Oct 25 08:37:20 2024 +0800 >>>> >>>> block: model freeze & enter queue as lock for supporting lockdep >>>> >>> >>> Thank you very much Tony. Since you did not respond to the question about >>> bisect I assumed that you would not do it. I ended up duplicating the bisect >>> effort after getting an environment in which I can reproduce the issue. Doing so >>> I am able to confirm the commit pointed to by bisect. >>> The commit cannot be reverted cleanly so I could not test v6.13-rc1 with it >>> reverted. >>> > Gi> > Ming Lei: I'd be happy to help with testing if you do not have hardware with >>> which you can reproduce the issue. >> >> One datapoint that I neglected to mention: btrfs does not seem to be required. The system >> I tested on used ext4 filesystem resulting in trace below: > > Hi Reinette and Tony, > > The warning is triggered because the two subsystems are connected with > &cpu_hotplug_lock. > > rdt_get_tree(): > cpus_read_lock(); > mutex_lock(&rdtgroup_mutex); > ... > > blk_mq_realloc_hw_ctxs() > mutex_lock(&q->sysfs_lock); > ... > blk_mq_alloc_and_init_hctx() > blk_mq_init_hctx > cpuhp_state_add_instance_nocalls > __cpuhp_state_add_instance > cpus_read_lock(); > > Given cpus_read_lock() is often implied in cpuhp APIs, I feel rdt_get_tree() > may re-order the two locks for avoiding the dependency. This is not possible for exactly the reason you provide ("cpus_read_lock() is often implied in cpuhp APIs"). resctrl relies on hotplug state callbacks for its initialization. You can find the callback setup in: arch/x86/kernel/cpu/resctrl/core.c: static int __init resctrl_late_init(void) { ... state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/resctrl/cat:online:", resctrl_arch_online_cpu, resctrl_arch_offline_cpu); ... } Since resctrl code is called by the CPU hotplug subsystem with cpu_hotplug_lock already held it is not possible for resctrl to change the lock ordering. Reinette