linux-kernel - Re: ld.lld: error: undefined symbol: memcpy

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Date:   Wed, 8 Mar 2023 23:14:58 +0100
From:   Marco Elver <elver@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: ld.lld: error: undefined symbol: memcpy

On Wed, 8 Mar 2023 at 22:07, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Thu, 9 Mar 2023 05:01:04 +0800 kernel test robot <lkp@...el.com> wrote:
>
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   63355b9884b3d1677de6bd1517cd2b8a9bf53978
> > commit: 36be5cba99f6f9984a9a9f0454f95a38f4184d3e kasan: treat meminstrinsic as builtins in uninstrumented files
> > date:   6 days ago
> > config: powerpc-randconfig-r036-20230305 (https://download.01.org/0day-ci/archive/20230309/202303090422.ss2Hbm4f-lkp@intel.com/config)
> > compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
> > 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 powerpc cross compiling tool for clang build
> >         # apt-get install binutils-powerpc-linux-gnu
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=36be5cba99f6f9984a9a9f0454f95a38f4184d3e
> >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 36be5cba99f6f9984a9a9f0454f95a38f4184d3e
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash
> >
> > If you fix the issue, kindly add following tag where applicable
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Link: https://lore.kernel.org/oe-kbuild-all/202303090422.ss2Hbm4f-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>):
> >
> > >> ld.lld: error: undefined symbol: memcpy
> >    >>> referenced by xmon.c:1896 (arch/powerpc/xmon/xmon.c:1896)
> >    >>>               arch/powerpc/xmon/xmon.o:(prregs) in archive vmlinux.a
> >    >>> referenced by zstd_compress.c:4814 (lib/zstd/compress/zstd_compress.c:4814)
> >    >>>               lib/zstd/compress/zstd_compress.o:(ZSTD_createCDict_advanced2) in archive vmlinux.a
> >    >>> referenced by zstd_compress.c:4910 (lib/zstd/compress/zstd_compress.c:4910)
> >    >>>               lib/zstd/compress/zstd_compress.o:(ZSTD_initStaticCDict) in archive vmlinux.a
> >    >>> referenced 5 more times
> > --
> > >> ld.lld: error: undefined symbol: memset
> >    >>> referenced by slab_common.c:579 (mm/slab_common.c:579)
> >    >>>               mm/slab_common.o:(kmem_dump_obj) in archive vmlinux.a
> >    >>> referenced by kasan_test.c:558 (mm/kasan/kasan_test.c:558)
> >    >>>               mm/kasan/kasan_test.o:(kmalloc_oob_in_memset) in archive vmlinux.a
> >    >>> referenced by kasan_test.c:505 (mm/kasan/kasan_test.c:505)
> >    >>>               mm/kasan/kasan_test.o:(kmalloc_oob_memset_2) in archive vmlinux.a
> >    >>> referenced 10 more times
> >
>
> Will this fix?

I think this patch got lost:
https://lkml.kernel.org/r/20230227094726.3833247-1-elver@google.com

By the looks of it 36be5cba99f6f9984a9a9f0454f95a38f4184d3e in
mainline doesn't have any of the powerpc bits.

Thanks,
-- Marco