tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e3a8b6a1e70c37702054ae3c7c07ed828435d8ee commit: 7326e382c21e9c23c89c88369afdc90b82a14da8 fanotify: report old and/or new parent+name in FAN_RENAME event date: 5 weeks ago config: hexagon-randconfig-r045-20220117 (https://download.01.org/0day-ci/archive/20220118/202201181811.egJXbMCF-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c10cbb243cafc0cf42c3e922cb29183279444432) 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7326e382c21e9c23c89c88369afdc90b82a14da8 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash fs/notify/fanotify/ 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 >>): struct fanotify_info *info; ^ 1 warning generated. vim +/info +154 fs/notify/fanotify/fanotify_user.c 7326e382c21e9c Amir Goldstein 2021-11-29 149 b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 150 static size_t fanotify_event_len(unsigned int info_mode, 929943b38daf81 Amir Goldstein 2020-07-16 151 struct fanotify_event *event) 5e469c830fdb5a Amir Goldstein 2019-01-10 152 { b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 153 size_t event_len = FAN_EVENT_METADATA_LEN; b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 @154 struct fanotify_info *info; b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 155 int fh_len; 929943b38daf81 Amir Goldstein 2020-07-16 156 int dot_len = 0; f454fa610a69b9 Amir Goldstein 2020-07-16 157 b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 158 if (!info_mode) b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 159 return event_len; b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 160 130a3c742107ac Gabriel Krisman Bertazi 2021-10-25 161 if (fanotify_is_error_event(event->mask)) 130a3c742107ac Gabriel Krisman Bertazi 2021-10-25 162 event_len += FANOTIFY_ERROR_INFO_LEN; 130a3c742107ac Gabriel Krisman Bertazi 2021-10-25 163 b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 164 info = fanotify_event_info(event); b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 165 7326e382c21e9c Amir Goldstein 2021-11-29 166 if (fanotify_event_has_any_dir_fh(event)) { 7326e382c21e9c Amir Goldstein 2021-11-29 167 event_len += fanotify_dir_name_info_len(event); d3424c9bac893b Matthew Bobrowski 2021-08-08 168 } else if ((info_mode & FAN_REPORT_NAME) && d3424c9bac893b Matthew Bobrowski 2021-08-08 169 (event->mask & FAN_ONDIR)) { 929943b38daf81 Amir Goldstein 2020-07-16 170 /* 929943b38daf81 Amir Goldstein 2020-07-16 171 * With group flag FAN_REPORT_NAME, if name was not recorded in 929943b38daf81 Amir Goldstein 2020-07-16 172 * event on a directory, we will report the name ".". 929943b38daf81 Amir Goldstein 2020-07-16 173 */ 929943b38daf81 Amir Goldstein 2020-07-16 174 dot_len = 1; 929943b38daf81 Amir Goldstein 2020-07-16 175 } afc894c784c84c Jan Kara 2020-03-24 176 af579beb666aef Matthew Bobrowski 2021-08-08 177 if (info_mode & FAN_REPORT_PIDFD) b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 178 event_len += FANOTIFY_PIDFD_INFO_HDR_LEN; af579beb666aef Matthew Bobrowski 2021-08-08 179 4bd5a5c8e6e5cd Gabriel Krisman Bertazi 2021-10-25 180 if (fanotify_event_has_object_fh(event)) { 4bd5a5c8e6e5cd Gabriel Krisman Bertazi 2021-10-25 181 fh_len = fanotify_event_object_fh_len(event); b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 182 event_len += fanotify_fid_info_len(fh_len, dot_len); 4bd5a5c8e6e5cd Gabriel Krisman Bertazi 2021-10-25 183 } 5e469c830fdb5a Amir Goldstein 2019-01-10 184 b9928e80dda84b Gabriel Krisman Bertazi 2021-10-25 185 return event_len; 5e469c830fdb5a Amir Goldstein 2019-01-10 186 } 5e469c830fdb5a Amir Goldstein 2019-01-10 187 :::::: The code at line 154 was first introduced by commit :::::: b9928e80dda84b349ba8de01780b9bef2fc36ffa fanotify: Fold event size calculation to its own function :::::: TO: Gabriel Krisman Bertazi <krisman(a)collabora.com&gt; :::::: CC: Jan Kara <jack(a)suse.cz&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org