reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/commit/?id=32f999ced5d222fee0e23a34fb9356362d0e1ef7
        git remote add mhiramat https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git
        git fetch --no-tags mhiramat topic/fprobe-on-fgraph
        git checkout 32f999ced5d222fee0e23a34fb9356362d0e1ef7
        # 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_FUNCTION_GRAPH_TRACER --selectors CONFIG_FPROBE -a=i386
        # 2. reproduce by make
           cd linux
           # download the config file from the "config:" link in the report, and save it as .config
           make ARCH=i386 olddefconfig