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Add C based test that runs 4 bpf programs in parallel that update the same hash and array maps. And another 2 threads that read from these two maps via lookup(key, value, BPF_F_LOCK) api to make sure the user space sees consistent value in both hash and array elements while user space races with kernel bpf progs. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>