Hi Marco, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.2-rc1 next-20190522] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Marco-Elver/mm-kasan-Print-frame-description-for-stack-bugs/20190519-040214 config: xtensa-allmodconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from include/linux/printk.h:7:0, from include/linux/kernel.h:15, from include/linux/kallsyms.h:10, from include/linux/ftrace.h:11, from mm/kasan/report.c:18: mm/kasan/report.c: In function 'print_decoded_frame_descr': include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 2 has type 'long unsigned int' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH' #define KERN_ERR KERN_SOH "3" /* error conditions */ ^~~~~~~~ include/linux/printk.h:304:9: note: in expansion of macro 'KERN_ERR' printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~ >> mm/kasan/report.c:233:2: note: in expansion of macro 'pr_err' pr_err("this frame has %zu %s:\n", num_objects, ^~~~~~ mm/kasan/report.c:233:27: note: format string is defined here pr_err("this frame has %zu %s:\n", num_objects, ~~^ %lu In file included from include/linux/printk.h:7:0, from include/linux/kernel.h:15, from include/linux/kallsyms.h:10, from include/linux/ftrace.h:11, from mm/kasan/report.c:18: include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 2 has type 'long unsigned int' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH' #define KERN_ERR KERN_SOH "3" /* error conditions */ ^~~~~~~~ include/linux/printk.h:304:9: note: in expansion of macro 'KERN_ERR' printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~ mm/kasan/report.c:260:3: note: in expansion of macro 'pr_err' pr_err(" [%zu, %zu) '%s'", offset, offset + size, token); ^~~~~~ mm/kasan/report.c:260:15: note: format string is defined here pr_err(" [%zu, %zu) '%s'", offset, offset + size, token); ~~^ %lu In file included from include/linux/printk.h:7:0, from include/linux/kernel.h:15, from include/linux/kallsyms.h:10, from include/linux/ftrace.h:11, from mm/kasan/report.c:18: include/linux/kern_levels.h:5:18: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'long unsigned int' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH' #define KERN_ERR KERN_SOH "3" /* error conditions */ ^~~~~~~~ include/linux/printk.h:304:9: note: in expansion of macro 'KERN_ERR' printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~ mm/kasan/report.c:260:3: note: in expansion of macro 'pr_err' pr_err(" [%zu, %zu) '%s'", offset, offset + size, token); ^~~~~~ mm/kasan/report.c:260:20: note: format string is defined here pr_err(" [%zu, %zu) '%s'", offset, offset + size, token); ~~^ %lu vim +/pr_err +233 mm/kasan/report.c 214 215 static void print_decoded_frame_descr(const char *frame_descr) 216 { 217 /* 218 * We need to parse the following string: 219 * "n alloc_1 alloc_2 ... alloc_n" 220 * where alloc_i looks like 221 * "offset size len name" 222 * or "offset size len name:line". 223 */ 224 225 char token[64]; 226 unsigned long num_objects; 227 228 if (!tokenize_frame_descr(&frame_descr, token, sizeof(token), 229 &num_objects)) 230 return; 231 232 pr_err("\n"); > 233 pr_err("this frame has %zu %s:\n", num_objects, 234 num_objects == 1 ? "object" : "objects"); 235 236 while (num_objects--) { 237 unsigned long offset; 238 unsigned long size; 239 240 /* access offset */ 241 if (!tokenize_frame_descr(&frame_descr, token, sizeof(token), 242 &offset)) 243 return; 244 /* access size */ 245 if (!tokenize_frame_descr(&frame_descr, token, sizeof(token), 246 &size)) 247 return; 248 /* name length (unused) */ 249 if (!tokenize_frame_descr(&frame_descr, NULL, 0, NULL)) 250 return; 251 /* object name */ 252 if (!tokenize_frame_descr(&frame_descr, token, sizeof(token), 253 NULL)) 254 return; 255 256 /* Strip line number, if it exists. */ 257 strreplace(token, ':', '\0'); 258 259 /* Finally, print object information. */ 260 pr_err(" [%zu, %zu) '%s'", offset, offset + size, token); 261 } 262 } 263 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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