reproduce (this is a W=1 build):
        git remote add xiang-erofs https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
        git fetch xiang-erofs fixes
        git checkout xiang-erofs/fixes
        b4 shazam https://lore.kernel.org/r/20240902110620.2202586-5-hongzhen@linux.alibaba.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 fs/erofs/