On Mon, Feb 15, 2021 at 2:49 AM kernel test robot <lkp@xxxxxxxxx> wrote: > > Hi Nick, > > First bad commit (maybe != root cause): > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y > head: 642aa3284e09f63bf1d4832798dd787b4320ca64 > commit: f05f667f8764f9ec834ca3e412ed7f5a20dea3bf [2231/4843] lib/string.c: implement stpcpy > config: x86_64-randconfig-a005-20210215 (attached as .config) > compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) > 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 > # install x86_64 cross compiling tool for clang build > # apt-get install binutils-x86-64-linux-gnu > # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=f05f667f8764f9ec834ca3e412ed7f5a20dea3bf > git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git > git fetch --no-tags linux-stable-rc linux-5.4.y > git checkout f05f667f8764f9ec834ca3e412ed7f5a20dea3bf > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>): > > >> ERROR: "__memcat_p" [drivers/hwtracing/stm/stm_core.ko] undefined! This error is unrelated to the referenced commit, but we did fix this error finally in 5.7: https://github.com/ClangBuiltLinux/linux/issues/515. This is not a regression, but something that never worked with LLD until 5.7. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7273ad2b08f8ac9563579d16a3cf528857b26f49 looks like the commit of interest, though I seem to have left a comment implying there were dependencies: https://github.com/ClangBuiltLinux/linux/issues/515#issuecomment-612999929 (I no longer recall what they were). Some other commits in tree reference that bug from the issue tracker. https://github.com/0day-ci/linux/commit/0cf9baa2dbb8ca29f30ac8a1afb69de51f222d17 https://github.com/0day-ci/linux/commit/565508bb949dd72638b52522fb6ac6ec04ec57fc https://github.com/0day-ci/linux/commit/0d0537aa772566473bd5310be3874060cbff8672 Not sure whether all 4 of the above worth backporting to 4.4.y? Thoughts? (Perhaps these would allow us to add x86_64 allmodconfig CI coverage with LLD for 4.4.y) > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx -- Thanks, ~Nick Desaulniers
