linux-kernel - Re: Cannot find symbol for section 69: .text.arch_max_swapfile

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Message-ID: <b2bd6c726f075c6c7c4c4d3037db0e978b32cb78.camel@intel.com>
Date:   Tue, 15 Aug 2023 01:49:35 +0000
From:   "Liu, Yujie" <yujie.liu@...el.com>
To:     "nathan@...nel.org" <nathan@...nel.org>,
        "peterx@...hat.com" <peterx@...hat.com>, lkp <lkp@...el.com>
CC:     "Huang, Ying" <ying.huang@...el.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "oe-kbuild-all@...ts.linux.dev" <oe-kbuild-all@...ts.linux.dev>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: Cannot find symbol for section 69: .text.arch_max_swapfile_size.

On Mon, 2023-08-14 at 08:47 -0700, Nathan Chancellor wrote:
> On Mon, Aug 14, 2023 at 11:38:18AM -0400, Peter Xu wrote:
> > On Sat, Aug 12, 2023 at 09:11:33AM +0800, kernel test robot wrote:
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   190bf7b14b0cf3df19c059061be032bd8994a597
> > > commit: be45a4902c7caa717fee6b2f671e59b396ed395c mm/swap: cache maximum swapfile size when init swap
> > > date:   11 months ago
> > > config: mips-randconfig-r014-20230811 (https://download.01.org/0day-ci/archive/20230812/202308120906.Efohswpa-lkp@intel.com/config)
> > > compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> > > reproduce: (https://download.01.org/0day-ci/archive/20230812/202308120906.Efohswpa-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/202308120906.Efohswpa-lkp@intel.com/
> > > 
> > > All errors (new ones prefixed by >>):
> > > 
> > > > > Cannot find symbol for section 69: .text.arch_max_swapfile_size.
> > >    mm/swapfile.o: failed
> > 
> > Hmm.. I don't really know what's the issue here, neither can I reproduce
> > this locally - the cross build seems to all work with the reproducer and I
> > can see mm/swapfile.o correctly generated.
> 
> This is https://github.com/ClangBuiltLinux/linux/issues/1830 and
> https://github.com/ClangBuiltLinux/linux/issues/981, which is a bug in
> recordmcount with regards to section symbols that occurs when building
> with clang's integrated assembler. It happens when the there are only
> weak symbols in a .text section, which occurs more often with MIPS due
> to LD_DEAD_CODE_DATA_ELIMINATION implying -ffunction-sections (i.e., any
> __weak symbol will trigger this) and I can see this randconfig setting
> it.
> 
> Unfortunately, the robot seems to have tripped over this a lot over the
> weekend :/ Intel folks, can this type of warning please be added to your
> filter for at least MIPS + LD_DEAD_CODE_DATA_ELIMINATION so that people
> don't get bothered?

Sorry for the noise. We've added this type of warning to the filter of
the bot.

Thanks,
Yujie

> https://lore.kernel.org/202308121810.APAJIBxn-lkp@intel.com/
> https://lore.kernel.org/202308121535.otQuZept-lkp@intel.com/
> https://lore.kernel.org/202308121810.APAJIBxn-lkp@intel.com/
> https://lore.kernel.org/202308121246.0TYkHC1K-lkp@intel.com/
> https://lore.kernel.org/202308120553.IRzzfaXL-lkp@intel.com/
> https://lore.kernel.org/202308111956.QRc8XJVr-lkp@intel.com/
> 
> Cheers,
> Nathan
>