On Thu, Feb 08, 2024 at 06:00:13AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 2ae0a045e6814c8c1d676d6153c605a65746aa29 > commit: 5084a4cd510f887a4fcc9f3386de1fbea698c7c4 [4186/4898] ubsan: reintroduce signed overflow sanitizer > config: s390-randconfig-r063-20240207 (https://download.01.org/0day-ci/archive/20240208/202402080538.FNTaeLJO-lkp@xxxxxxxxx/config) > compiler: s390-linux-gcc (GCC) 13.2.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240208/202402080538.FNTaeLJO-lkp@xxxxxxxxx/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202402080538.FNTaeLJO-lkp@xxxxxxxxx/ > > Note: the linux-next/master HEAD 2ae0a045e6814c8c1d676d6153c605a65746aa29 builds fine. > It may have been fixed somewhere. > > All errors (new ones prefixed by >>): > > s390-linux-ld: arch/s390/kernel/debug.o: in function `debug_output': > >> debug.c:(.text+0x17ea): undefined reference to `__ubsan_handle_divrem_overflow' I'm not able to reproduce these warnings. I'm using the config above and s390x-linux-gnu-gcc (Ubuntu 13.2.0-4ubuntu3) 13.2.0 I would expect adding this to arch/s390/kernel/Makefile would fix it: UBSAN_SANITIZE_debug.o := n But I can't meaningfully verify the fix... -- Kees Cook
