reproduce (this is a W=1 build):
        git checkout 88d324e69ea9f3ae1c1905ea75d717c08bdb8e15
        b4 shazam https://lore.kernel.org/r/20250322-initrd-erofs-v2-6-d66ee4a2c756@cyberus-technology.de
        # 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 fs/romfs/