reproduce:
        git remote add netfilter-nf https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git
        git fetch netfilter-nf main
        git checkout netfilter-nf/main
        b4 shazam https://lore.kernel.org/r/20250103140158.69041-1-egyszeregy@freemail.hu
        # 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_NETFILTER_XT_DSCP --selectors CONFIG_NETFILTER_XT_MATCH_DSCP -a=nios2
        # 2. reproduce by make
           cd linux
           # download the config file from the "config:" link in the report, and save it as .config
           make ARCH=nios2 olddefconfig