tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/pstore head: dcaa1e76b774398d32576838c1352ed57a6d6674 commit: 6bcaa233a90ba3be98a6093cf346ac51eb05258f [8/35] pstore: Add locking around superblock changes config: alpha-randconfig-r024-20200519 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 6bcaa233a90ba3be98a6093cf346ac51eb05258f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): 288 | struct dentry *psinfo_lock_root(void) | ^~~~~~~~~~~~~~~~ vim +/psinfo_lock_root +288 fs//pstore/inode.c 287 289 { 290 struct dentry *root; 291 292 mutex_lock(&pstore_sb_lock); 293 /* 294 * Having no backend is fine -- no records appear. 295 * Not being mounted is fine -- nothing to do. 296 */ 297 if (!psinfo || !pstore_sb) { 298 mutex_unlock(&pstore_sb_lock); 299 return NULL; 300 } 301 302 root = pstore_sb->s_root; 303 inode_lock(d_inode(root)); 304 mutex_unlock(&pstore_sb_lock); 305 306 return root; 307 } 308 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org