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McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , christian.koenig@amd.com, Shakeel Butt , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Christian Brauner , Wei Yang , David Hildenbrand , Miaohe Lin , Al Viro , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, Yu Zhao , Roman Gushchin , Mateusz Guzik , Matthew Wilcox , Baolin Wang , Aboorva Devarajan , Aishwarya TCV References: <20251213185608.3418096-1-mathieu.desnoyers@efficios.com> <20251213185608.3418096-3-mathieu.desnoyers@efficios.com> <72ad1fed-574e-4850-beac-91626e5aaa0e@efficios.com> <2a772584-2269-4008-809a-6123e226ebe3@sirena.org.uk> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: <2a772584-2269-4008-809a-6123e226ebe3@sirena.org.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: YT4PR01CA0276.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:109::13) To YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT2PR01MB9175:EE_|YQBPR01MB10916:EE_ X-MS-Office365-Filtering-Correlation-Id: 49d14bcf-f76d-4d52-31ce-08de3f17d59d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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((3*BITS_TO_LONGS(NR_CPUS))-1 + ((69905 * NR_MM_COUNTERS * 64) / BYTES_PER_LONG))] = 0UL }, > > That doesn't seem to fix the FVP unfortunately (BYTES_PER_LONG doesn't > exist, but even just deleting the division entirely fails in the same > way). I just noticed that there is another static instance of mm_struct: drivers/firmware/efi/efi.c struct mm_struct efi_mm we need to apply the same fix to it as well. It seems to fit with the currently running task when the oops happens: [ 2.482454] CPU: 2 UID: 0 PID: 12 Comm: kworker/u32:0 Not tainted 6.19.0-rc1-next-20251218 #1 PREEMPT [ 2.482609] Workqueue: efi_rts_wq efi_call_rts [...] [ 2.485094] acct_account_cputime+0x40/0xa4 (P) [...] [ 2.487172] el1h_64_irq+0x6c/0x70 [...] [ 2.487853] __efi_rt_asm_wrapper+0x50/0x74 Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com