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This add a test to make sure that we can still pin maps with reused map fd. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201006021345.3817033-4-liuhangbin@gmail.com