Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git randconfig-v5.12 head: fd21c2581b744639b5207c11651ab40abf13701a commit: 8c9828cf709354ab06136e924a5e2e6b5cdb12d2 [372/597] [HACK] always use integrated assembler with clang config: x86_64-randconfig-a006-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de) 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/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground randconfig-v5.12 git checkout 8c9828cf709354ab06136e924a5e2e6b5cdb12d2 # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): .section .entry.text, "ax" ^ .pushsection .altinstr_replacement,"ax" ^ <instantiation>:1:1: note: while in macro instantiation ALTERNATIVE "jmp .Lend_2", "", ( 7*32+11) ^ arch/x86/entry/entry_64.S:93:2: note: while in macro instantiation SWITCH_TO_KERNEL_CR3 scratch_reg=%rsp ^ arch/x86/entry/entry_64.S:741:2: warning: DWARF2 only supports one section per compilation unit .section .fixup, "ax" ^ -- .section ".head.text","ax" ^ arch/x86/kernel/head_64.S:352:2: warning: DWARF2 only supports one section per compilation unit .section ".init.text","ax" ^ vim +47 arch/x86/entry/entry_64.S 6fd166aae78c0a arch/x86/entry/entry_64.S Peter Zijlstra 2017-12-04 45 ^1da177e4c3f41 arch/x86_64/kernel/entry.S Linus Torvalds 2005-04-16 46 .code64 ea7145477a461e arch/x86/kernel/entry_64.S Jiri Olsa 2011-03-07 @47 .section .entry.text, "ax" ea7145477a461e arch/x86/kernel/entry_64.S Jiri Olsa 2011-03-07 48 :::::: The code at line 47 was first introduced by commit :::::: ea7145477a461e09d8d194cac4b996dc4f449107 x86: Separate out entry text section :::::: TO: Jiri Olsa <jolsa(a)redhat.com&gt; :::::: CC: Ingo Molnar <mingo(a)elte.hu&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org