linux-kernel - Re: [PATCH v2 6/6] selftests: livepatch: Test livepatching function using an external symbol

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Message-ID: <202405190214.M93ZmZJb-lkp@intel.com>
Date: Thu, 23 May 2024 15:21:12 +0800
From: kernel test robot <yujie.liu@...el.com>
To: Lukas Hruska <lhruska@...e.cz>, <pmladek@...e.com>, <mbenes@...e.cz>,
	<jpoimboe@...nel.org>
CC: <oe-kbuild-all@...ts.linux.dev>, <joe.lawrence@...hat.com>,
	<live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-kbuild@...r.kernel.org>, <mpdesouza@...e.com>, <lhruska@...e.cz>,
	<llvm@...ts.linux.dev>
Subject: Re: [PATCH v2 6/6] selftests: livepatch: Test livepatching function
 using an external symbol

Hi Lukas,

kernel test robot noticed the following build errors:

[auto build test ERROR on masahiroy-kbuild/fixes]
[also build test ERROR on shuah-kselftest/next shuah-kselftest/fixes linus/master v6.9]
[cannot apply to masahiroy-kbuild/for-next next-20240517]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lukas-Hruska/livepatch-Add-klp-convert-tool/20240516-223103
base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git fixes
patch link:    https://lore.kernel.org/r/20240516133009.20224-7-lhruska%40suse.cz
patch subject: [PATCH v2 6/6] selftests: livepatch: Test livepatching function using an external symbol
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce:
  $ clang --version
  clang version 18.1.5 (git://gitmirror/llvm_project 617a15a9eac96088ae5e9134248d8236e34b91b1)
  Target: x86_64-unknown-linux-gnu

  $ cd linux

  # download the attached config file and save it as .config

  $ make ARCH=x86_64 LLVM=1 -j$(nproc) olddefconfig
  $ make ARCH=x86_64 LLVM=1 -j$(nproc)
  $ export KDIR=$PWD
  $ make ARCH=x86_64 LLVM=1 -j$(nproc) -C tools/testing/selftests/livepatch

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 <yujie.liu@...el.com>
| Closes: https://lore.kernel.org/r/202405190214.M93ZmZJb-lkp@intel.com/

All errors (new ones prefixed by >>, old ones prefixed by <<):

  make: Entering directory 'tools/testing/selftests/livepatch'
  make -C test_modules
  make[1]: Entering directory 'tools/testing/selftests/livepatch/test_modules'
  make -C /root/linux modules KBUILD_EXTMOD=tools/testing/selftests/livepatch/test_modules
  make[2]: Entering directory '/root/linux'
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_atomic_replace.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_callbacks_busy.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_callbacks_demo.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_callbacks_demo2.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_callbacks_mod.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_extern.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_extern_hello.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_livepatch.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_state.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_state2.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_state3.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_shadow_vars.o
    CC [M]  tools/testing/selftests/livepatch/test_modules/test_klp_syscall.o
    MODPOST tools/testing/selftests/livepatch/test_modules/Module.symvers
>> ERROR: modpost: "".klp.sym.rela.test_klp_extern_hello.test_klp_extern_hello.hello_msg,0"" [tools/testing/selftests/livepatch/test_modules/test_klp_extern.ko] undefined!
  make[4]: *** [scripts/Makefile.modpost:146: tools/testing/selftests/livepatch/test_modules/Module.symvers] Error 1
  make[3]: *** [Makefile:1873: modpost] Error 2
  make[2]: *** [Makefile:240: __sub-make] Error 2
  make[2]: Leaving directory 'linux'
  make[1]: *** [Makefile:21: modules] Error 2
  make[1]: Leaving directory 'tools/testing/selftests/livepatch/test_modules'
  make: *** [../lib.mk:107: gen_mods_dir] Error 2
  make: Leaving directory 'tools/testing/selftests/livepatch'


FYI, this build error is captured when using clang compiler, while
there is no such error when using gcc, so this may be a
compiler specific issue.

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki


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