tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-rewrite-indexing head: c4c64220b16dd9204a79685fe34d61c1b7f858a6 commit: c4c64220b16dd9204a79685fe34d61c1b7f858a6 [74/74] cachefiles: Add tracepoints to log errors from ops on the backing fs config: i386-randconfig-r034-20211013 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/com... git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git git fetch --no-tags dhowells-fs fscache-rewrite-indexing git checkout c4c64220b16dd9204a79685fe34d61c1b7f858a6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): trace_cachefiles_vfs_error(object, d_backing_inode(dentry), ret, ^~~ fs/cachefiles/namei.c:331:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. vim +/ret +347 fs/cachefiles/namei.c 320 321 /* 322 * Open an existing file, checking its attributes and replacing it if it is 323 * stale. 324 */ 325 static bool cachefiles_open_file(struct cachefiles_object *object, 326 struct dentry *dentry) 327 { 328 struct cachefiles_cache *cache = object->volume->cache; 329 struct file *file; 330 struct path path; 331 int ret; 332 333 _enter("%pd", dentry); 334 335 if (!cachefiles_mark_inode_in_use(object, dentry)) 336 return false; 337 338 /* We need to open a file interface onto a data file now as we can't do 339 * it on demand because writeback called from do_exit() sees 340 * current->fs == NULL - which breaks d_path() called from ext4 open. 341 */ 342 path.mnt = cache->mnt; 343 path.dentry = dentry; 344 file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT, 345 d_backing_inode(dentry), cache->cache_cred); 346 if (IS_ERR(file)) { 348 cachefiles_trace_open_error); 349 goto error; 350 } 351 352 if (unlikely(!file->f_op->read_iter) || 353 unlikely(!file->f_op->write_iter)) { 354 pr_notice("Cache does not support read_iter and write_iter\n"); 355 goto error_fput; 356 } 357 _debug("file -> %pd positive", dentry); 358 359 ret = cachefiles_check_auxdata(object, file); 360 if (ret < 0) 361 goto check_failed; 362 363 object->file = file; 364 365 /* Always update the atime on an object we've just looked up (this is 366 * used to keep track of culling, and atimes are only updated by read, 367 * write and readdir but not lookup or open). 368 */ 369 touch_atime(&file->f_path); 370 dput(dentry); 371 return true; 372 373 check_failed: 374 fscache_cookie_lookup_negative(object->cookie); 375 cachefiles_unmark_inode_in_use(object, file); 376 cachefiles_mark_object_inactive(object, file); 377 if (ret == -ESTALE) { 378 fput(file); 379 dput(dentry); 380 return cachefiles_create_file(object); 381 } 382 error_fput: 383 fput(file); 384 error: 385 dput(dentry); 386 return false; 387 } 388 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org