tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.14 head: 7a7ddea1b419e20931152e388252c661b6fca95c commit: 405e6328081c15dd441b6671fa0d38e6b148c0a7 [38/79] net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup config: x86_64-randconfig-a013-20200517 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: 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 git checkout 405e6328081c15dd441b6671fa0d38e6b148c0a7 # 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: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 -- Warning: objdump says 4 bytes, but insn_get_length() says 2 Warning: arch/x86/tools/test_get_len found difference at <memcpy_page_flushcache>:ffffffff819d6c20 .. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org