Regressions on riscv tinyconfig and lkftconfig failed with clang-20 and gcc-13 on the Linux next-20250422 tag onwards.

The defconfig builds pass but tinyconfig and lkftconfig (compat and VDSO) failed.

First seen on the next-20250422 Good: next-20250417 Bad: next-20250422..next-20250423

Regressions found on riscv: - build/rv32-clang-20-tinyconfig - build/rv32-clang-20-tinyconfig - build/korg-clang-20-lkftconfig-hardening - build/gcc-13-lkftconfig

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

Build regression: riscv vdso.so.dbg dynamic relocations are not supported

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

## Build log riscv build errors with gcc arch/riscv/kernel/vdso/vdso.so.dbg: dynamic relocations are not supported make[3]: *** [arch/riscv/kernel/vdso/Makefile:60: arch/riscv/kernel/vdso/vdso.so.dbg] Error 1

build errors with clang ld.lld: error: version script assignment of 'LINUX_4.15' to symbol '__vdso_getrandom' failed: symbol not defined llvm-nm: error: arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg: No such file or directory ld.lld: error: version script assignment of 'LINUX_4.15' to symbol '__vdso_getrandom' failed: symbol not defined llvm-objcopy: error: 'arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg': No such file or directory arch/riscv/kernel/compat_signal.c:220:28: error: use of undeclared identifier 'compat__vdso_rt_sigreturn_offset' 220 | regs->ra = (unsigned long)COMPAT_VDSO_SYMBOL( | ^ arch/riscv/include/asm/vdso.h:29:42: note: expanded from macro 'COMPAT_VDSO_SYMBOL' 29 | (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) | ^ <scratch space>:317:1: note: expanded from here 317 | compat__vdso_rt_sigreturn_offset | ^ 1 error generated.

## Source * Kernel version: 6.15.0-rc3 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: 2c9c612abeb38aab0e87d48496de6fd6daafb00b * Git describe: next-20250422 * Project details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250422/ * Architectures: riscv * Toolchains: clang-20, gcc-13 * Kconfigs: lkftconfig

## Build riscv * Build log: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250422/tes... * Build history: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250422/tes... * Build details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250422/tes... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2w5Fmeq3a09b3torxIis2... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2w5Fmeq3a09b3torxIis2...

## Steps to reproduce on riscv - tuxmake --runtime podman --target-arch riscv --toolchain clang-20 --kconfig tinyconfig --kconfig-add rv32_defconfig LLVM=1 - tuxmake --runtime podman --target-arch riscv --toolchain gcc-13 --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2w5Fmeq3a09b3torxIis2...

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