linux-kernel - Re: ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol '.L.str.6'; recompile with -fPIC

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Date:   Thu, 14 Sep 2023 10:41:01 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: ld.lld: error: relocation R_RISCV_HI20 cannot be used against
 symbol '.L.str.6'; recompile with -fPIC

On Wed, Sep 13, 2023 at 11:14 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Sami,
>
> FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   aed8aee11130a954356200afa3f1b8753e8a9482
> commit: 74f8fc31feb4b756814ec0720f48ccdc1175f774 riscv: Allow CONFIG_CFI_CLANG to be selected
> date:   3 weeks ago
> config: riscv-randconfig-r002-20230912 (https://download.01.org/0day-ci/archive/20230914/202309141433.6gzJPSYA-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230914/202309141433.6gzJPSYA-lkp@intel.com/reproduce)
>
> 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 <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202309141433.6gzJPSYA-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> ld.lld: error: relocation R_RISCV_HI20 cannot be used against symbol '.L.str.6'; recompile with -fPIC
>    >>> defined in vmlinux.a(arch/riscv/errata/sifive/errata.o)
>    >>> referenced by errata.c:94 (arch/riscv/errata/sifive/errata.c:94)
>    >>>               arch/riscv/errata/sifive/errata.o:(sifive_errata_patch_func) in archive vmlinux.a
> --
> >> ld.lld: error: relocation R_RISCV_LO12_I cannot be used against symbol '.L.str.6'; recompile with -fPIC
>    >>> defined in vmlinux.a(arch/riscv/errata/sifive/errata.o)
>    >>> referenced by errata.c:94 (arch/riscv/errata/sifive/errata.c:94)
>    >>>               arch/riscv/errata/sifive/errata.o:(sifive_errata_patch_func) in archive vmlinux.a

This randconfig builds a fairly large 64-bit kernel with
CONFIG_CMODEL_MEDLOW=y. Switching to CMODEL_MEDANY fixed the linker
error for me, although the laterr BTFIDS step still fails:

  BTFIDS  vmlinux
WARN: resolve_btfids: unresolved symbol bpf_cpumask
FAILED elf_update(WRITE): no error
make[3]: *** [../scripts/Makefile.vmlinux:36: vmlinux] Error 255

64-bit defconfig with CFI+CMODEL_MEDLOW works just fine and I can also
reproduce the linker errors by building allyesconfig+CMODEL_MEDLOW
without CFI, for example, so I assume the build failure with this
config is expected. Is there anything we should do here?

Sami