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Fri, 09 Feb 2024 22:41:45 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCWiQHvx1eksAu9I0C+I6GQ2b/sjiwh+NM4LLGbspjRvom93rD4s0Rt70l1Y5mk9Il9LeBKdeRPo7sIZ/mvvSDywn1/ITaVthavo3QFGhdwiL82V2aGA/zEZOcYriwjegMufjGEY2BWs7gWPgbSQQR0= Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id i11-20020a17090332cb00b001d9cfb9af20sm2444010plr.70.2024.02.09.22.41.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Feb 2024 22:41:44 -0800 (PST) Date: Fri, 9 Feb 2024 22:41:44 -0800 From: Kees Cook To: kernel test robot Cc: oe-kbuild-all@lists.linux.dev, Linux Memory Management List , Andrew Morton , Marco Elver Subject: Re: [linux-next:master 4186/4898] debug.c:undefined reference to `__ubsan_handle_divrem_overflow' Message-ID: <202402092240.A6DFC1875B@keescook> References: <202402080538.FNTaeLJO-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202402080538.FNTaeLJO-lkp@intel.com> X-Rspamd-Queue-Id: 59D951C000D X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: d1umz4q89c3t5efei6sibzsqt7wokzte X-HE-Tag: 1707547306-968139 X-HE-Meta: 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 fugVvKB4 mYyeamXb73IZCjJOve8NPTPssHpnG8ZjXrppbDRvOj6Uvi1eCa6Jp/m9DBQGY8Lo9ViPbXlElQnLpJhkPFc5IN6DcIiE373VIeOdMoH9R11FQPCJIUsd6aveHVCqZziWDGOmNfH9E8Feu6SjnR+Rcqf+iOJM5ST79oPRsdk2lUB3I+up0ShylDfjqd7iU37GtBgqRTon9wn0oP2OkmeBOwGA+5NFccBkno6gAxdQP12rVZ3sqocJw8twIYbfmntt4lRj5z2BvPn2zhpQ1DKS7xusgi+CbJHZjWws+Vhsr4+yF1wWeDYHmkRJ+k8HvC2D8LMbhd2JDqIUQh9Ich8iVFE7h4so+X6GhrLKFgx4I83543TRHTd9Iw4zcvlNRpHmKOmooPcCkTYW5Ww1GFzoCuBscRwg3hCzZMyPeOsdA8W42NMNWGy7WJ0nr1jQpE/PZ273nqLXXtbx0PaAvIrogsg7BGZNR938sFn0FGxa1AXXJALnQnppNfFqvse/11NS92wB9v7ANS4+WaAvJTpKpCyeUpmI679CGQa5b X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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@intel.com/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@intel.com/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 > | Closes: https://lore.kernel.org/oe-kbuild-all/202402080538.FNTaeLJO-lkp@intel.com/ > > 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