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

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Date:   Fri, 2 Dec 2022 10:42:23 +0100
From:   Marco Elver <elver@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Kefeng Wang <wangkefeng.wang@...wei.com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: Re: ld.lld: error: undefined symbol: __tsan_memset

On Fri, 2 Dec 2022 at 10:32, kernel test robot <lkp@...el.com> wrote:
>
> Hi Kefeng,
>
> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   a4412fdd49dc011bcc2c0d81ac4cab7457092650
> commit: dd03762ab608e058c8f390ad9cf667e490089796 arm64: Enable KCSAN
> date:   12 months ago
> config: arm64-randconfig-r006-20221201
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036)
> 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 arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dd03762ab608e058c8f390ad9cf667e490089796
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout dd03762ab608e058c8f390ad9cf667e490089796
>         # 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=arm64 SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> ld.lld: error: undefined symbol: __tsan_memset
>    >>> referenced by main.c
>    >>>               main.o:(init_setup) in archive init/built-in.a
>    >>> referenced by main.c
>    >>>               main.o:(rdinit_setup) in archive init/built-in.a
>    >>> referenced by main.c
>    >>>               main.o:(do_one_initcall) in archive init/built-in.a
>    >>> referenced 8519 more times
> --
> >> ld.lld: error: undefined symbol: __tsan_memcpy
>    >>> referenced by main.c
>    >>>               main.o:(do_one_initcall) in archive init/built-in.a
>    >>> referenced by initramfs.c
>    >>>               initramfs.o:(panic_show_mem) in archive init/built-in.a
>    >>> referenced by initramfs.c
>    >>>               initramfs.o:(do_collect) in archive init/built-in.a
>    >>> referenced 3922 more times
> --
> >> ld.lld: error: undefined symbol: __tsan_memmove
>    >>> referenced by main.c
>    >>>               main.o:(repair_env_string) in archive init/built-in.a
>    >>> referenced by range.c
>    >>>               range.o:(add_range_with_merge) in archive kernel/built-in.a
>    >>> referenced by core.c
>    >>>               bpf/core.o:(bpf_patch_insn_single) in archive kernel/built-in.a
>    >>> referenced 88 more times

The fix for this has been in -next (-rcu) for a while. Once it hits
mainline, it should also reach stable kernels since I attached Cc:
stable tags to the patches.

Given Clang 16 isn't even released yet, I think this is fair and does
not require urgency at this point.

Thanks,
-- Marco