reproduce (this is a W=1 build):
        git checkout e0c2ee9edcacfdda0e806166eaec1310cdf9e324
        # 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 net/can/