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Wed, 10 Jun 2026 17:48:08 +0000 Message-ID: <28449c4f-49e6-4342-938c-4a3699e3d682@intel.com> Date: Wed, 10 Jun 2026 10:48:06 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 00/11] x86,fs/resctrl: Fix long-standing issues To: , , , , , , CC: , , , , , , , , References: Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0323.namprd04.prod.outlook.com (2603:10b6:303:82::28) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|SJ2PR11MB7617:EE_ X-MS-Office365-Filtering-Correlation-Id: c2a565f9-f691-4e39-d9a3-08dec7186ed3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|23010399003|7416014|22082099003|18002099003|6133799003|5023799004|56012099006|11063799006; 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More issues > were uncovered as fixes were developed and reviewed. While the goal is to > fix all issues the races surrounding pseudo-locked regions are not yet > solved and have been removed from this series (last appearance was in V3 of > this series). > > Applies against tip/master to ensure it considers pending x86/cache changes > as well as the lockdep_is_cpus_held() stubs available in smp/core. > > Changes since V4: > - Add new fix to prevent out-of-bouds read when SNC is enabled and domain > with busy RMID goes offline. > - Add substitute for "is domain going offline" check to workers to avoid > reading any event counters on soon-to-be-offline domain since its > cpu_mask is empty and reading an event counter on an SNC enabled system > depends on knowing a CPU associated with the domain. > > Changes since V3: > - Drop majority of pseudo-locking fixes, only keep the double free/double > list add fix. > - Add patch to help document safe RCU list traversal. > - See individual patches for detailed changes. > > [1] https://sashiko.dev/#/patchset/20260429184858.36423-1-tony.luck%40intel.com > > Reinette Chatre (8): > x86,fs/resctrl: Prevent out-of-bounds access while offlining CPU when > SNC enabled > x86,fs/resctrl: Document safe RCU list traversal > fs/resctrl: Fix deadlock on errors during mount > fs/resctrl: Prevent use-after-free in rdtgroup_kn_put() > fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list > fs/resctrl: Prevent deadlock and use-after-free in info file handlers > x86/resctrl: Ensure domain fully initialized before placed on RCU list > fs/resctrl: Fix UAF from worker threads when domains are removed > > Tony Luck (3): > fs/resctrl: Move functions to avoid forward references in subsequent > fixes > fs/resctrl: Free mon_data structures on rdt_get_tree() failure > fs/resctrl: Fix use-after-free during unmount Addressing Sashiko [2] review feedback here: [PATCH v5 05/11] fs/resctrl: Fix use-after-free during unmount Sashiko encountered a "Tool error" during review of this patch. It was able to complete review of identical patch submitted as part of V4 [3]. Even though Sashiko encountered the "Tool error" it did report a new issue. To help make progress with the existing fixes I would like to propose that adding new fixes to this series be stopped. I will start a new series of fixes to address any new reports. [PATCH v5 07/11] fs/resctrl: Prevent use-after-free in rdtgroup_kn_put() [PATCH v5 08/11] fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list The existing pseudo-locking related issues are known and have been dropped from this series (last appearance was in V3) while trying to determine how to fix them. [PATCH v5 11/11] fs/resctrl: Fix UAF from worker threads when domains are removed Sashiko again (previously reported in V3) reported that this would trigger a lockdep splat on MPAM. As described in response to previous report [4] this is a false positive since MPAM does not support the software controller. Sashiko also reports that "Does this exact ID matching and premature break miss multiple L3 monitor domains on Sub-NUMA Clustering (SNC) systems?" This is a false positive since the software controller cannot be used on SNC systems. For confirmation, see: commit ac20aa423052 ("x86/resctrl: Block use of mba_MBps mount option on Sub-NUMA Cluster (SNC) systems") After considering the latest Sashiko feedback and deciding to stop adding new fixes to this series, I do think this series can now be considered as "settled". If there are no concerns with this series self then I would like to proceed for it to be considered for inclusion. Thank you very much. Reinette [2] https://sashiko.dev/#/patchset/cover.1781029125.git.reinette.chatre%40intel.com [3] https://sashiko.dev/#/patchset/cover.1780456704.git.reinette.chatre%40intel.com?part=4 [4] https://lore.kernel.org/lkml/9ea1986a-a88f-4224-b530-252e0f5cbfd0@intel.com/