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Check that 4Gbyte arena can be allocated and overflow/underflow access in the first and the last page behaves as expected. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/20240315021834.62988-5-alexei.starovoitov@gmail.com