reproduce (this is a W=1 build):
        git remote add rw-ubifs https://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs.git
        git fetch rw-ubifs next
        git checkout rw-ubifs/next
        b4 shazam https://lore.kernel.org/r/20240410074033.2523399-3-chengzhihao1@huawei.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash