reproduce:
        git checkout linux/master
        b4 shazam https://lore.kernel.org/r/facb7d2e23dbf5e8a411a9e9d02b7c8baab99b88.1709914259.git.bristot@kernel.org
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf