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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2025 12:41:52.0355 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 827a9a89-2e14-406f-7e2e-08de17b1b37f X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB3PEPF0000885F.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR08MB10613 X-Rspamd-Queue-Id: 7FA5440011 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: d3hgzh95danfyuya1xzbrqrr5ipegzzh X-HE-Tag: 1761828122-311623 X-HE-Meta: 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 zlaQkJEP 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Harry, > On Wed, Oct 29, 2025 at 07:19:29PM +0100, Andrey Ryabinin wrote: > > > > > > On 10/27/25 1:28 PM, Harry Yoo wrote: > > > > > slab->obj_exts |= MEMCG_DATA_OBJEXTS; > > > slab_set_stride(slab, sizeof(struct slabobj_ext)); > > > + } else if (obj_exts_in_object(s)) { > > > + unsigned int offset = obj_exts_offset_in_object(s); > > > + > > > + slab->obj_exts = (unsigned long)slab_address(slab); > > > + slab->obj_exts += s->red_left_pad; > > > + slab->obj_exts += obj_exts_offset_in_object(s); > > > + if (IS_ENABLED(CONFIG_MEMCG)) > > > + slab->obj_exts |= MEMCG_DATA_OBJEXTS; > > > + slab_set_stride(slab, s->size); > > > + > > > + for_each_object(addr, s, slab_address(slab), slab->objects) { > > > + kasan_unpoison_range(addr + offset, > > > + sizeof(struct slabobj_ext)); > > > > Is this leftover from previous version? Otherwise I don't get why we unpoison this. > > Oh god, yes! Thanks for catching. Will fix in the next version. > Not only this, there would be possible case for WARN_ON() in the kasan_unpoison_range() for unaligned address with KASAN_GRANULE_SIZE when: - No debug information. - object size = 24 byte. - align = 32 bytes. - sizeof(struct slabobj_ext) = 8 (CONFIG_MEMCG=y && CONFIG_MEM_ALLOC_PROFILING=n) - using KASAN_HW_TAG (KASAN_GRANULE_SIZE = 16 bytes). Thanks. -- Sincerely, Yeoreum Yun