Cannot find symbol for section 69: .text.arch_max_swapfile_size.

Cannot find symbol for section 69: .text.arch_max_swapfile_size.

[kernel test robot]

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@intel.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

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: Cannot find symbol for section 69: .text.arch_max_swapfile_size.

[Peter Xu]

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@intel.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.

$ wget https://download.01.org/0day-ci/archive/20230812/202308120906.Efohswpa-lkp@intel.com/config
$ mv config .config
$ COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ./make.cross W=1 O=build_dir ARCH=mips olddefconfig
[...]
$ COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ./make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash
[...]
FIT description: Linux 6.5.0-rc4-00492-gad3232df3e41
Created:         Mon Aug 14 11:35:57 2023
 Image 0 (kernel)
  Description:  Linux 6.5.0-rc4-00492-gad3232df3e41
  Created:      Mon Aug 14 11:35:57 2023
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    1767982 Bytes = 1726.54 KiB = 1.69 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x8043e5f0
  Hash algo:    sha1
  Hash value:   750e28c2fdd0d73eec9b0d8dbf5655579cb1364c
 Default Configuration: 'conf-default'
 Configuration 0 (conf-default)
  Description:  Generic Linux kernel
  Kernel:       kernel
$ file build_dir/mm/swapfile.o 
build_dir/mm/swapfile.o: ELF 32-bit MSB relocatable, MIPS, MIPS32 version 1 (SYSV), not stripped

Please let me now if anyone knows what I'm missing.

-- 
Peter Xu

Re: Cannot find symbol for section 69: .text.arch_max_swapfile_size.

[Nathan Chancellor]

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@intel.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?

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

Re: Cannot find symbol for section 69: .text.arch_max_swapfile_size.

[Liu, Yujie]

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@intel.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
>