tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3d5895cd351757f69c9a66fb5fc8cf19f454d773 commit: f4e44b393389c77958f7c58bf4415032b4cda15b NFSD: delay unmount source's export after inter-server copy completed. date: 8 weeks ago config: parisc-allyesconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 10.3.0 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 f4e44b393389c77958f7c58bf4415032b4cda15b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=parisc 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 >>): fs/nfsd/nfs4proc.c: In function 'nfsd4_ssc_setup_dul': 1219 | strncpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strncpy +1219 fs/nfsd/nfs4proc.c 1174 1175 /* 1176 * setup a work entry in the ssc delayed unmount list. 1177 */ 1178 static int nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr, 1179 struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt) 1180 { 1181 struct nfsd4_ssc_umount_item *ni = 0; 1182 struct nfsd4_ssc_umount_item *work = NULL; 1183 struct nfsd4_ssc_umount_item *tmp; 1184 DEFINE_WAIT(wait); 1185 1186 *ss_mnt = NULL; 1187 *retwork = NULL; 1188 work = kzalloc(sizeof(*work), GFP_KERNEL); 1189 try_again: 1190 spin_lock(&nn->nfsd_ssc_lock); 1191 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) { 1192 if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr))) 1193 continue; 1194 /* found a match */ 1195 if (ni->nsui_busy) { 1196 /* wait - and try again */ 1197 prepare_to_wait(&nn->nfsd_ssc_waitq, &wait, 1198 TASK_INTERRUPTIBLE); 1199 spin_unlock(&nn->nfsd_ssc_lock); 1200 1201 /* allow 20secs for mount/unmount for now - revisit */ 1202 if (signal_pending(current) || 1203 (schedule_timeout(20*HZ) == 0)) { 1204 kfree(work); 1205 return nfserr_eagain; 1206 } 1207 finish_wait(&nn->nfsd_ssc_waitq, &wait); 1208 goto try_again; 1209 } 1210 *ss_mnt = ni->nsui_vfsmount; 1211 refcount_inc(&ni->nsui_refcnt); 1212 spin_unlock(&nn->nfsd_ssc_lock); 1213 kfree(work); 1214 1215 /* return vfsmount in ss_mnt */ 1216 return 0; 1217 } 1218 if (work) { 1220 refcount_set(&work->nsui_refcnt, 2); 1221 work->nsui_busy = true; 1222 list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list); 1223 *retwork = work; 1224 } 1225 spin_unlock(&nn->nfsd_ssc_lock); 1226 return 0; 1227 } 1228 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org