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

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Date:   Thu, 1 Dec 2022 09:00:57 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     kernel test robot <lkp@...el.com>,
        Mikhail Zhilkin <csharper2005@...il.com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        NOGUCHI Hiroshi <drvlabo@...il.com>
Subject: Re: ld.lld: error: undefined symbol: __udivdi3

On Thu, Dec 01, 2022 at 09:16:10AM +0100, Miquel Raynal wrote:
> Hi Mikhail, Hiroshi,
> 
> lkp@...el.com wrote on Thu, 1 Dec 2022 01:46:36 +0800:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   01f856ae6d0ca5ad0505b79bf2d22d7ca439b2a1
> > commit: 9b78ef0c7997052e9eaa0f7a4513d546fa17358c mtd: parsers: add support for Sercomm partitions
> > date:   6 months ago
> > config: mips-randconfig-r033-20221128
> > 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 mips cross compiling tool for clang build
> >         # apt-get install binutils-mipsel-linux-gnu
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b78ef0c7997052e9eaa0f7a4513d546fa17358c
> >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 9b78ef0c7997052e9eaa0f7a4513d546fa17358c
> >         # 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=mips 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: __udivdi3  
> >    >>> referenced by scpart.c
> >    >>>               mtd/parsers/scpart.o:(scpart_parse) in archive drivers/built-in.a  
> > 
> 
> Can you please try to reproduce this with a mips toolchain as advised
> and send a fix?

For what it's worth, this is likely our bug:

https://github.com/ClangBuiltLinux/linux/issues/1635

It sounds like there are some merged LLVM patches that should help but I
guess not based on this report...

Cheers,
Nathan