next-20250730 x86, s390, riscv gcc-8 hardening.config vmlinux symbol `.modinfo' required but not present

next-20250730 x86, s390, riscv gcc-8 hardening.config vmlinux symbol `.modinfo' required but not present

[Naresh Kamboju]

Regressions while building x86, S390 and riscv64 with hardening.config on the
Linux next-20250730 and next-20250731.

Build pass with gcc-13 with hardening.config fails with gcc-8

Regression Analysis:
- New regression? Yes
- Reproducibility? Yes

First seen on the next-20250730
Good: next-20250729
Bad: next-20250730

Build regression: next-20250730 x86 gcc-8 hardening.config vmlinux
symbol `.modinfo' required but not present
Build regression: next-20250730 S390 gcc-8 hardening.config vmlinux
symbol `.modinfo' required but not present
Build regression: next-20250730 riscv64 gcc-8 hardening.config vmlinux
symbol `__rela_dyn_end' required but not present

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

## Build log x86
x86_64-linux-gnu-objcopy: vmlinux: symbol `.modinfo' required but not present
x86_64-linux-gnu-objcopy:vmlinux: no symbols
make[3]: *** [scripts/Makefile.vmlinux:97: vmlinux] Error 1
make[3]: Target '__default' not remade because of errors.

## Build log S390
s390x-linux-gnu-ld: .tmp_vmlinux1: warning: allocated section
`.got.plt' not in segment
s390x-linux-gnu-ld: .tmp_vmlinux2: warning: allocated section
`.got.plt' not in segment
s390x-linux-gnu-ld: vmlinux.unstripped: warning: allocated section
`.got.plt' not in segment
s390x-linux-gnu-objcopy: vmlinux: warning: allocated section
`.got.plt' not in segment
s390x-linux-gnu-objcopy: vmlinux: symbol `.modinfo' required but not present
s390x-linux-gnu-objcopy:vmlinux: no symbols
make[3]: *** [scripts/Makefile.vmlinux:97: vmlinux] Error

## Build log riscv64
riscv64-linux-gnu-objcopy: vmlinux.unstripped: warning: empty loadable
segment detected at vaddr=0xffffffff81e5b000, is this intentional?
riscv64-linux-gnu-objcopy: vmlinux: symbol `__rela_dyn_end' required
but not present
riscv64-linux-gnu-objcopy:vmlinux: no symbols
make[3]: *** [scripts/Makefile.vmlinux:97: vmlinux] Error 1

## Source
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git sha: 84b92a499e7eca54ba1df6f6c6e01766025943f1
* Git describe: next-20250731
* Project details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250731
* Architectures: x86, s390, riscv
* Toolchains: gcc-8
* Kconfigs: hardening.config

## Build
* Build details 1:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250731/testrun/29316787/suite/build/test/gcc-8-lkftconfig-hardening/details/
* Build details 2:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250731/testrun/29317240/suite/build/test/gcc-8-lkftconfig-hardening/details/
* Build details 3:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250731/testrun/29317236/suite/build/test/gcc-8-lkftconfig-hardening/details/
* Build history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250731/testrun/29316787/suite/build/test/gcc-8-lkftconfig-hardening/history/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/30cmb9OdgONks9mQHuMJ5hkW09f/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/30cmb9OdgONks9mQHuMJ5hkW09f/config

## Steps to reproduce
 * tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-8
--kconfig defconfig \
           --kconfig-add CONFIG_DEBUG_INFO_REDUCED=y \
           --kconfig-add CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y \
           --kconfig-add CONFIG_IGB=y \
           --kconfig-add hardening.config

--
Linaro LKFT
https://lkft.linaro.org

Re: next-20250730 x86, s390, riscv gcc-8 hardening.config vmlinux symbol `.modinfo' required but not present

[Arnd Bergmann]

On Thu, Jul 31, 2025, at 15:32, Naresh Kamboju wrote:
> Regressions while building x86, S390 and riscv64 with hardening.config on the
> Linux next-20250730 and next-20250731.
>
> Build pass with gcc-13 with hardening.config fails with gcc-8
>
> Regression Analysis:
> - New regression? Yes
> - Reproducibility? Yes
>
> First seen on the next-20250730
> Good: next-20250729
> Bad: next-20250730
>
> Build regression: next-20250730 x86 gcc-8 hardening.config vmlinux
> symbol `.modinfo' required but not present
> Build regression: next-20250730 S390 gcc-8 hardening.config vmlinux
> symbol `.modinfo' required but not present
> Build regression: next-20250730 riscv64 gcc-8 hardening.config vmlinux
> symbol `__rela_dyn_end' required but not present
>
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

My guess is that this is caused by 94564d1bb059 ("kbuild: keep .modinfo
section in vmlinux.unstripped")

See also
https://lore.kernel.org/all/202507310505.tEYm1za7-lkp@intel.com/
https://lore.kernel.org/all/20250728135753.432695A72-agordeev@linux.ibm.com/

Reverting 94564d1bb059 solved the problem for me on arm64.

      Arnd