reproduce (this is a W=1 build):
        # https://github.com/isilence/linux/commit/bb34a467261478f55af42bf8d18638d67e300b5f
        git remote add isilence https://github.com/isilence/linux
        git fetch --no-tags isilence zcrx/next
        git checkout bb34a467261478f55af42bf8d18638d67e300b5f
        # 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