tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/array-bounds/next-20210816/v1 head: b07d5e8190ca172b1ffddd1412b921296000b379 commit: ecc23a9ee765008e439113eea38fb1cbbd3d7c83 [9/10] Makefile: Enable -Warray-bounds config: s390-randconfig-r001-20210816 (attached as .config) compiler: s390-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/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees kspp/array-bounds/next-20210816/v1 git checkout ecc23a9ee765008e439113eea38fb1cbbd3d7c83 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 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 >>): In file included from include/linux/string.h:262, from include/linux/bitmap.h:10, from include/linux/cpumask.h:12, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/rcupdate.h:29, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from include/linux/ratelimit.h:6, from include/linux/dev_printk.h:16, from include/linux/device.h:15, from arch/s390/kernel/machine_kexec.c:10: In function 'memcpy', inlined from '__do_machine_kdump' at arch/s390/kernel/machine_kexec.c:58:2: 20 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:191:16: note: in expansion of macro '__underlying_memcpy' 191 | return __underlying_memcpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~ vim +/__builtin_memcpy +20 include/linux/fortify-string.h a28a6e860c6cf2 Francis Laniel 2021-02-25 4 a28a6e860c6cf2 Francis Laniel 2021-02-25 5 a28a6e860c6cf2 Francis Laniel 2021-02-25 6 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) a28a6e860c6cf2 Francis Laniel 2021-02-25 7 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); a28a6e860c6cf2 Francis Laniel 2021-02-25 8 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp); a28a6e860c6cf2 Francis Laniel 2021-02-25 9 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy); a28a6e860c6cf2 Francis Laniel 2021-02-25 10 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove); a28a6e860c6cf2 Francis Laniel 2021-02-25 11 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset); a28a6e860c6cf2 Francis Laniel 2021-02-25 12 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat); a28a6e860c6cf2 Francis Laniel 2021-02-25 13 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy); a28a6e860c6cf2 Francis Laniel 2021-02-25 14 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen); a28a6e860c6cf2 Francis Laniel 2021-02-25 15 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat); a28a6e860c6cf2 Francis Laniel 2021-02-25 16 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy); a28a6e860c6cf2 Francis Laniel 2021-02-25 17 #else a28a6e860c6cf2 Francis Laniel 2021-02-25 18 #define __underlying_memchr __builtin_memchr a28a6e860c6cf2 Francis Laniel 2021-02-25 19 #define __underlying_memcmp __builtin_memcmp a28a6e860c6cf2 Francis Laniel 2021-02-25 @20 #define __underlying_memcpy __builtin_memcpy a28a6e860c6cf2 Francis Laniel 2021-02-25 21 #define __underlying_memmove __builtin_memmove a28a6e860c6cf2 Francis Laniel 2021-02-25 22 #define __underlying_memset __builtin_memset a28a6e860c6cf2 Francis Laniel 2021-02-25 23 #define __underlying_strcat __builtin_strcat a28a6e860c6cf2 Francis Laniel 2021-02-25 24 #define __underlying_strcpy __builtin_strcpy a28a6e860c6cf2 Francis Laniel 2021-02-25 25 #define __underlying_strlen __builtin_strlen a28a6e860c6cf2 Francis Laniel 2021-02-25 26 #define __underlying_strncat __builtin_strncat a28a6e860c6cf2 Francis Laniel 2021-02-25 27 #define __underlying_strncpy __builtin_strncpy a28a6e860c6cf2 Francis Laniel 2021-02-25 28 #endif a28a6e860c6cf2 Francis Laniel 2021-02-25 29 :::::: The code at line 20 was first introduced by commit :::::: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header. :::::: TO: Francis Laniel <laniel_francis(a)privacyrequired.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org