reproduce (this is a W=1 build):
        git remote add shuah-kselftest https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git
        git fetch shuah-kselftest kunit-fixes
        git checkout shuah-kselftest/kunit-fixes
        b4 shazam https://lore.kernel.org/r/20230728154419.1810177-8-janusz.krzysztofik@linux.intel.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash lib/