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Tue, 14 Oct 2025 23:09:45 +0000 Message-ID: <5163ce35-f843-41a3-abfc-5af91b7c68bc@intel.com> Date: Tue, 14 Oct 2025 16:09:43 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] fs/resctrl: Fix MBM events being unconditionally enabled in mbm_event mode To: "Moger, Babu" , , , , , , CC: , , , , , References: <6082147693739c4514e4a650a62f805956331d51.1759263540.git.babu.moger@amd.com> <2cdc5b52-a00c-4772-8221-8d98b787722a@intel.com> <0cd2c8ac-8dee-4280-b726-af0119baa4a1@amd.com> <1315076d-24f9-4e27-b945-51564cadfaed@intel.com> <3f3b4ca6-e11e-4258-b60c-48b823b7db4f@intel.com> <0e52d4fe-0ff7-415a-babd-acf3c39f9d30@amd.com> <7292333a-a4f1-4217-8c72-436812f29be8@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0287.namprd03.prod.outlook.com (2603:10b6:303:b5::22) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|PH7PR11MB6794:EE_ X-MS-Office365-Filtering-Correlation-Id: d7f148a7-66d7-4cc6-6804-08de0b76c40a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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I saw the issues. It fails to mount in my case with panic trace. >> >> (Just to ensure that there is not anything else going on) Could you please confirm if the panic is from >> mon_add_all_files()->mon_event_read()->mon_event_count()->__mon_event_count()->resctrl_arch_reset_rmid() >> that creates the MBM event files during mount and then does the initial read of RMID to determine the >> starting count? > > It happens just before that (at mbm_cntr_get). We have not allocated d->cntr_cfg for the counters. > ===================Panic trace ================================= > > 349.330416] BUG: kernel NULL pointer dereference, address: 0000000000000008 > [  349.338187] #PF: supervisor read access in kernel mode > [  349.343914] #PF: error_code(0x0000) - not-present page > [  349.349644] PGD 10419f067 P4D 0 > [  349.353241] Oops: Oops: 0000 [#1] SMP NOPTI > [  349.357905] CPU: 45 UID: 0 PID: 3449 Comm: mount Not tainted 6.18.0-rc1+ #120 PREEMPT(voluntary) > [  349.367803] Hardware name: AMD Corporation PURICO/PURICO, BIOS RPUT1003E 12/11/2024 > [  349.376334] RIP: 0010:mbm_cntr_get+0x56/0x90 > [  349.381096] Code: 45 8d 41 fe 83 f8 01 77 3d 8b 7b 50 85 ff 7e 36 49 8b 84 24 f0 04 00 00 45 31 c0 eb 0d 41 83 c0 01 48 83 c0 10 44 39 c7 74 1c <48> 3b 50 08 75 ed 3b 08 75 e9 48 83 c4 10 44 89 c0 5b 41 5c 41 5d > [  349.402037] RSP: 0018:ff56bba58655f958 EFLAGS: 00010246 > [  349.407861] RAX: 0000000000000000 RBX: ffffffff9525b900 RCX: 0000000000000002 > [  349.415818] RDX: ffffffff95d526a0 RSI: ff1f5d52517c1800 RDI: 0000000000000020 > [  349.423774] RBP: ff56bba58655f980 R08: 0000000000000000 R09: 0000000000000001 > [  349.431730] R10: ff1f5d52c616a6f0 R11: fffc6a2f046c3980 R12: ff1f5d52517c1800 > [  349.439687] R13: 0000000000000001 R14: ffffffff95d526a0 R15: ffffffff9525b968 > [  349.447635] FS:  00007f17926b7800(0000) GS:ff1f5d59d45ff000(0000) knlGS:0000000000000000 > [  349.456659] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [  349.463064] CR2: 0000000000000008 CR3: 0000000147afe002 CR4: 0000000000771ef0 > [  349.471022] PKRU: 55555554 > [  349.474033] Call Trace: > [  349.476755]  > [  349.479091]  ? kernfs_add_one+0x114/0x170 > [  349.483560]  rdtgroup_assign_cntr_event+0x9b/0xd0 > [  349.488795]  rdtgroup_assign_cntrs+0xab/0xb0 > [  349.493553]  rdt_get_tree+0x4be/0x770 > [  349.497623]  vfs_get_tree+0x2e/0xf0 > [  349.501508]  fc_mount+0x18/0x90 > [  349.505007]  path_mount+0x360/0xc50 > [  349.508884]  ? putname+0x68/0x80 > [  349.512479]  __x64_sys_mount+0x124/0x150 > [  349.516848]  x64_sys_call+0x2133/0x2190 > [  349.521123]  do_syscall_64+0x74/0x970 > > ================================================================== Thank you for capturing this. This is a different trace but it confirms that it is the same root cause. Specifically, event is enabled after the state it depends on is (not) allocated during domain online. Reinette