tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 66f4beaa6c1d28161f534471484b2daa2de1dce0 commit: c37495d6254c237578db3121dcf79857e033f8ff slab: add __alloc_size attributes for better bounds checking date: 6 days ago config: arm64-buildonly-randconfig-r001-20211111 (attached as .config) compiler: aarch64-linux-gcc (GCC) 11.2.0 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 c37495d6254c237578db3121dcf79857e033f8ff # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm64 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 >>): drivers/edac/thunderx_edac.c: In function 'thunderx_ocx_lnk_threaded_isr': 1220 | strncat(msg, other, OCX_MESSAGE_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/edac/thunderx_edac.c: In function 'thunderx_ocx_com_threaded_isr': drivers/edac/thunderx_edac.c:1136:17: warning: 'strncat' specified bound 1024 equals destination size [-Wstringop-truncation] 1136 | strncat(msg, other, OCX_MESSAGE_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/edac/thunderx_edac.c:1145:33: warning: 'strncat' specified bound 1024 equals destination size [-Wstringop-truncation] 1145 | strncat(msg, other, OCX_MESSAGE_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/edac/thunderx_edac.c:1150:33: warning: 'strncat' specified bound 1024 equals destination size [-Wstringop-truncation] 1150 | strncat(msg, other, OCX_MESSAGE_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/edac/thunderx_edac.c: In function 'thunderx_l2c_threaded_isr': drivers/edac/thunderx_edac.c:1899:17: warning: 'strncat' specified bound 1024 equals destination size [-Wstringop-truncation] 1899 | strncat(msg, other, L2C_MESSAGE_SIZE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strncat +1220 drivers/edac/thunderx_edac.c 41003396f932d7 Sergey Temerkhanov 2017-03-24 1186 41003396f932d7 Sergey Temerkhanov 2017-03-24 1187 static irqreturn_t thunderx_ocx_lnk_threaded_isr(int irq, void *irq_id) 41003396f932d7 Sergey Temerkhanov 2017-03-24 1188 { 41003396f932d7 Sergey Temerkhanov 2017-03-24 1189 struct msix_entry *msix = irq_id; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1190 struct thunderx_ocx *ocx = container_of(msix, struct thunderx_ocx, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1191 msix_ent[msix->entry]); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1192 irqreturn_t ret = IRQ_NONE; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1193 unsigned long tail; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1194 struct ocx_link_err_ctx *ctx; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1195 41003396f932d7 Sergey Temerkhanov 2017-03-24 1196 char *msg; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1197 char *other; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1198 41003396f932d7 Sergey Temerkhanov 2017-03-24 1199 msg = kmalloc(OCX_MESSAGE_SIZE, GFP_KERNEL); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1200 other = kmalloc(OCX_OTHER_SIZE, GFP_KERNEL); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1201 41003396f932d7 Sergey Temerkhanov 2017-03-24 1202 if (!msg || !other) 41003396f932d7 Sergey Temerkhanov 2017-03-24 1203 goto err_free; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1204 41003396f932d7 Sergey Temerkhanov 2017-03-24 1205 while (CIRC_CNT(ocx->link_ring_head, ocx->link_ring_tail, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1206 ARRAY_SIZE(ocx->link_err_ctx))) { 41003396f932d7 Sergey Temerkhanov 2017-03-24 1207 tail = ring_pos(ocx->link_ring_head, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1208 ARRAY_SIZE(ocx->link_err_ctx)); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1209 41003396f932d7 Sergey Temerkhanov 2017-03-24 1210 ctx = &ocx->link_err_ctx[tail]; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1211 41003396f932d7 Sergey Temerkhanov 2017-03-24 1212 snprintf(msg, OCX_MESSAGE_SIZE, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1213 "%s: OCX_COM_LINK_INT[%d]: %016llx", 41003396f932d7 Sergey Temerkhanov 2017-03-24 1214 ocx->edac_dev->ctl_name, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1215 ctx->link, ctx->reg_com_link_int); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1216 41003396f932d7 Sergey Temerkhanov 2017-03-24 1217 decode_register(other, OCX_OTHER_SIZE, 41003396f932d7 Sergey Temerkhanov 2017-03-24 1218 ocx_com_link_errors, ctx->reg_com_link_int); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1219 41003396f932d7 Sergey Temerkhanov 2017-03-24 @1220 strncat(msg, other, OCX_MESSAGE_SIZE); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1221 41003396f932d7 Sergey Temerkhanov 2017-03-24 1222 if (ctx->reg_com_link_int & OCX_COM_LINK_INT_UE) 41003396f932d7 Sergey Temerkhanov 2017-03-24 1223 edac_device_handle_ue(ocx->edac_dev, 0, 0, msg); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1224 else if (ctx->reg_com_link_int & OCX_COM_LINK_INT_CE) 41003396f932d7 Sergey Temerkhanov 2017-03-24 1225 edac_device_handle_ce(ocx->edac_dev, 0, 0, msg); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1226 41003396f932d7 Sergey Temerkhanov 2017-03-24 1227 ocx->link_ring_tail++; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1228 } 41003396f932d7 Sergey Temerkhanov 2017-03-24 1229 41003396f932d7 Sergey Temerkhanov 2017-03-24 1230 ret = IRQ_HANDLED; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1231 err_free: 41003396f932d7 Sergey Temerkhanov 2017-03-24 1232 kfree(other); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1233 kfree(msg); 41003396f932d7 Sergey Temerkhanov 2017-03-24 1234 41003396f932d7 Sergey Temerkhanov 2017-03-24 1235 return ret; 41003396f932d7 Sergey Temerkhanov 2017-03-24 1236 } 41003396f932d7 Sergey Temerkhanov 2017-03-24 1237 :::::: The code at line 1220 was first introduced by commit :::::: 41003396f932d7f027725c7acebb6a7caa41dc3e EDAC, thunderx: Add Cavium ThunderX EDAC driver :::::: TO: Sergey Temerkhanov <s.temerkhanov(a)gmail.com&gt; :::::: CC: Borislav Petkov <bp(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org