Hi André, kernel test robot noticed the following build warnings:
[auto build test WARNING on 3ee84e3dd88e39b55b534e17a7b9a181f1d46809] url: https://github.com/intel-lab-lkp/linux/commits/Andr-Almeida/selftests-futex-Add-ASSERT_-macros/20250521-045231 base: 3ee84e3dd88e39b55b534e17a7b9a181f1d46809 patch link: https://lore.kernel.org/r/20250520-tonyk-robust_futex-v4-4-1123093e59de%40igalia.com patch subject: [PATCH v4 4/7] futex: Create set_robust_list2 config: arm-randconfig-r122-20250522 (https://download.01.org/0day-ci/archive/20250522/202505221953.jkgfsa3u-...@intel.com/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce: (https://download.01.org/0day-ci/archive/20250522/202505221953.jkgfsa3u-...@intel.com/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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202505221953.jkgfsa3u-...@intel.com/ sparse warnings: (new ones prefixed by >>) kernel/futex/core.c:581:38: sparse: sparse: cast removes address space '__user' of expression kernel/futex/core.c:581:51: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned int [noderef] [usertype] __user *naddr @@ got void * @@ kernel/futex/core.c:581:51: sparse: expected unsigned int [noderef] [usertype] __user *naddr kernel/futex/core.c:581:51: sparse: got void * kernel/futex/core.c:597:38: sparse: sparse: cast removes address space '__user' of expression kernel/futex/core.c:597:51: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned int [noderef] [usertype] __user *naddr @@ got void * @@ kernel/futex/core.c:597:51: sparse: expected unsigned int [noderef] [usertype] __user *naddr kernel/futex/core.c:597:51: sparse: got void * kernel/futex/core.c:1268:59: sparse: sparse: cast removes address space '__user' of expression >> kernel/futex/core.c:1268:59: sparse: sparse: incorrect type in argument 3 >> (different address spaces) @@ expected unsigned int [noderef] [usertype] >> __user *head @@ got unsigned int [usertype] * @@ kernel/futex/core.c:1268:59: sparse: expected unsigned int [noderef] [usertype] __user *head kernel/futex/core.c:1268:59: sparse: got unsigned int [usertype] * kernel/futex/core.c:978:9: sparse: sparse: context imbalance in 'futex_q_lockptr_lock' - wrong count at exit vim +1268 kernel/futex/core.c 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1247 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1248 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1249 * Walk curr->robust_list (very carefully, it's a userspace list!) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1250 * and mark any locks found there dead, and notify any waiters. 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1251 * 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1252 * We silently return on any sign of list-walking problem. 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1253 */ 1c5e99b662506e kernel/futex/core.c André Almeida 2025-05-20 1254 static void exit_robust_list32(struct task_struct *curr, 1c5e99b662506e kernel/futex/core.c André Almeida 2025-05-20 1255 struct robust_list_head32 __user *head) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1256 { 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1257 struct robust_list __user *entry, *next_entry, *pending; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1258 unsigned int limit = ROBUST_LIST_LIMIT, pi, pip; 3f649ab728cda8 kernel/futex.c Kees Cook 2020-06-03 1259 unsigned int next_pi; b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 1260 u32 uentry, next_uentry, upending; b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 1261 s32 futex_offset; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1262 int rc; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1263 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1264 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1265 * Fetch the list head (which was registered earlier, via 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1266 * sys_set_robust_list()): 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1267 */ b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 @1268 if (fetch_robust_entry32((u32 *)&uentry, &entry, (u32 *)&head->list.next, &pi)) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1269 return; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1270 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1271 * Fetch the relative futex offset: 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1272 */ 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1273 if (get_user(futex_offset, &head->futex_offset)) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1274 return; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1275 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1276 * Fetch any possibly pending lock-add first, and handle it 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1277 * if it exists: 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1278 */ b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 1279 if (fetch_robust_entry32(&upending, &pending, 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1280 &head->list_op_pending, &pip)) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1281 return; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1282 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1283 next_entry = NULL; /* avoid warning with gcc */ 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1284 while (entry != (struct robust_list __user *) &head->list) { 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1285 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1286 * Fetch the next entry in the list before calling 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1287 * handle_futex_death: 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1288 */ b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 1289 rc = fetch_robust_entry32(&next_uentry, &next_entry, b9412773325c3a kernel/futex/core.c André Almeida 2025-05-20 1290 (u32 __user *)&entry->next, &next_pi); 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1291 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1292 * A pending lock might already be on the list, so 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1293 * dont process it twice: 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1294 */ 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1295 if (entry != pending) { 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1296 void __user *uaddr = futex_uaddr(entry, futex_offset); 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1297 ca16d5bee59807 kernel/futex.c Yang Tao 2019-11-06 1298 if (handle_futex_death(uaddr, curr, pi, ca16d5bee59807 kernel/futex.c Yang Tao 2019-11-06 1299 HANDLE_DEATH_LIST)) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1300 return; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1301 } 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1302 if (rc) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1303 return; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1304 uentry = next_uentry; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1305 entry = next_entry; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1306 pi = next_pi; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1307 /* 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1308 * Avoid excessively long or circular lists: 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1309 */ 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1310 if (!--limit) 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1311 break; 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1312 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1313 cond_resched(); 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1314 } 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1315 if (pending) { 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1316 void __user *uaddr = futex_uaddr(pending, futex_offset); 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1317 ca16d5bee59807 kernel/futex.c Yang Tao 2019-11-06 1318 handle_futex_death(uaddr, curr, pip, HANDLE_DEATH_PENDING); 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1319 } 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1320 } 04e7712f446058 kernel/futex.c Arnd Bergmann 2018-04-17 1321 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
