[kbuild-all] [chrome-os:chromeos-5.4 15/93] include/linux/string.h:294:30: error: '__builtin_strncpy' specified bound 24 equals destination size

tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: fbd5b376aef3491b453cfdefd1faa1f2f5ccc240 commit: d7438be1154b21bdd4472a1cfd86395334764b89 [15/93] UPSTREAM: drm/i915/gem: Don't leak non-persistent requests on changing engines config: i386-randconfig-r035-20200710 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout d7438be1154b21bdd4472a1cfd86395334764b89 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/x86/include/asm/page_32.h:35, from arch/x86/include/asm/page.h:14, from arch/x86/include/asm/thread_info.h:12, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/slab.h:15, from include/linux/io-mapping.h:10, from drivers/gpu/drm/i915/gt/intel_gtt.h:19, from drivers/gpu/drm/i915/gt/gen6_ppgtt.h:9, from drivers/gpu/drm/i915/gem/i915_gem_context.c:72: In function 'strncpy', inlined from 'mock_context' at drivers/gpu/drm/i915/gem/selftests/mock_context.c:40:3: 294 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/string.h:304:9: note: in expansion of macro '__underlying_strncpy' 304 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/__builtin_strncpy +294 include/linux/string.h b008ae4cc74d3a Daniel Axtens 2020-06-03 272 b008ae4cc74d3a Daniel Axtens 2020-06-03 273 #ifdef CONFIG_KASAN b008ae4cc74d3a Daniel Axtens 2020-06-03 274 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); b008ae4cc74d3a Daniel Axtens 2020-06-03 275 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp); b008ae4cc74d3a Daniel Axtens 2020-06-03 276 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 277 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove); b008ae4cc74d3a Daniel Axtens 2020-06-03 278 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset); b008ae4cc74d3a Daniel Axtens 2020-06-03 279 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat); b008ae4cc74d3a Daniel Axtens 2020-06-03 280 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 281 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen); b008ae4cc74d3a Daniel Axtens 2020-06-03 282 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat); b008ae4cc74d3a Daniel Axtens 2020-06-03 283 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy); b008ae4cc74d3a Daniel Axtens 2020-06-03 284 #else b008ae4cc74d3a Daniel Axtens 2020-06-03 285 #define __underlying_memchr __builtin_memchr b008ae4cc74d3a Daniel Axtens 2020-06-03 286 #define __underlying_memcmp __builtin_memcmp b008ae4cc74d3a Daniel Axtens 2020-06-03 287 #define __underlying_memcpy __builtin_memcpy b008ae4cc74d3a Daniel Axtens 2020-06-03 288 #define __underlying_memmove __builtin_memmove b008ae4cc74d3a Daniel Axtens 2020-06-03 289 #define __underlying_memset __builtin_memset b008ae4cc74d3a Daniel Axtens 2020-06-03 290 #define __underlying_strcat __builtin_strcat b008ae4cc74d3a Daniel Axtens 2020-06-03 291 #define __underlying_strcpy __builtin_strcpy b008ae4cc74d3a Daniel Axtens 2020-06-03 292 #define __underlying_strlen __builtin_strlen b008ae4cc74d3a Daniel Axtens 2020-06-03 293 #define __underlying_strncat __builtin_strncat b008ae4cc74d3a Daniel Axtens 2020-06-03 @294 #define __underlying_strncpy __builtin_strncpy b008ae4cc74d3a Daniel Axtens 2020-06-03 295 #endif b008ae4cc74d3a Daniel Axtens 2020-06-03 296 :::::: The code at line 294 was first introduced by commit :::::: b008ae4cc74d3ab43074099746f6c32d353e01aa string.h: fix incompatibility between FORTIFY_SOURCE and KASAN :::::: TO: Daniel Axtens <dja(a)axtens.net&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org