https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84732
--- Comment #5 from Arnd Bergmann <arnd at linaro dot org> --- Created attachment 43586 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43586&action=edit drivers/gpu/drm/drm_property.c, preprocessed I found another case that appears to be related but not the same, attaching another (non-reduced) file for reference. The code that triggered a warning this time is: strncpy(property->name, name, DRM_PROP_NAME_LEN); property->name[DRM_PROP_NAME_LEN-1] = '\0'; but unlike the first one, this only happens with -fsanitize=kernel-address but not with -fsanitize-coverage=trace-pc: $ x86_64-linux-gcc-8.0.1 -fno-strict-aliasing -O2 -Wall -S drm_property.i -fsanitize=kernel-address /git/arm-soc/drivers/gpu/drm/drm_property.c: In function 'drm_property_create': /git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy' specified bound 32 equals destination size [-Wstringop-truncation] return __builtin_strncpy(p, q, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /git/arm-soc/drivers/gpu/drm/drm_property.c: In function 'drm_property_add_enum': /git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy' specified bound 32 equals destination size [-Wstringop-truncation] return __builtin_strncpy(p, q, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /git/arm-soc/include/linux/string.h:254:9: warning: '__builtin_strncpy' specified bound 32 equals destination size [-Wstringop-truncation] return __builtin_strncpy(p, q, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
