Hi Hyesoo, kernel test robot noticed the following build warnings: [auto build test WARNING on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Hyesoo-Yu/mm-slub-Panic-if-the-object-corruption-is-checked/20250120-163233 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250120082908.4162780-1-hyesoo.yu%40samsung.com patch subject: [PATCH] mm: slub: Panic if the object corruption is checked. config: mips-randconfig-r111-20250121 (https://download.01.org/0day-ci/archive/20250121/202501212026.lUnLNhv6-lkp@xxxxxxxxx/config) compiler: mips-linux-gcc (GCC) 14.2.0 reproduce: (https://download.01.org/0day-ci/archive/20250121/202501212026.lUnLNhv6-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202501212026.lUnLNhv6-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> mm/slub.c:1308:9: sparse: sparse: cast from restricted slab_flags_t mm/slub.c:1394:17: sparse: sparse: cast from restricted slab_flags_t mm/slub.c:4440:47: sparse: sparse: context imbalance in '__slab_free' - unexpected unlock vim +1308 mm/slub.c 1273 1274 /* Check the pad bytes at the end of a slab page */ 1275 static pad_check_attributes void 1276 slab_pad_check(struct kmem_cache *s, struct slab *slab) 1277 { 1278 u8 *start; 1279 u8 *fault; 1280 u8 *end; 1281 u8 *pad; 1282 int length; 1283 int remainder; 1284 1285 if (!(s->flags & SLAB_POISON)) 1286 return; 1287 1288 start = slab_address(slab); 1289 length = slab_size(slab); 1290 end = start + length; 1291 remainder = length % s->size; 1292 if (!remainder) 1293 return; 1294 1295 pad = end - remainder; 1296 metadata_access_enable(); 1297 fault = memchr_inv(kasan_reset_tag(pad), POISON_INUSE, remainder); 1298 metadata_access_disable(); 1299 if (!fault) 1300 return; 1301 while (end > fault && end[-1] == POISON_INUSE) 1302 end--; 1303 1304 slab_err(s, slab, "Padding overwritten. 0x%p-0x%p @offset=%tu", 1305 fault, end - 1, fault - start); 1306 print_section(KERN_ERR, "Padding ", pad, remainder); 1307 > 1308 BUG_ON(s->flags & SLAB_CORRUPTION_PANIC); 1309 1310 restore_bytes(s, "slab padding", POISON_INUSE, fault, end); 1311 } 1312 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
