reproduce:
        git remote add drm-misc git://anongit.freedesktop.org/drm/drm-misc
        git fetch --no-tags drm-misc drm-misc-next
        git checkout eb66d34d793ed48494820ce908c8c821b8e6cae5
        # choose either of the following two methods to reproduce the issue
        # 1. reproduce by kismet
           # install kmax per https://github.com/paulgazz/kmax/blob/master/README.md
           kismet --linux-ksrc=linux --selectees CONFIG_DRM_DISPLAY_HDMI_STATE_HELPER --selectors CONFIG_DRM_KUNIT_TEST -a=x86_64
        # 2. reproduce by make
           cd linux
           # download the config file from the "config:" link in the report, and save it as .config
           make ARCH=x86_64 olddefconfig