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Add regression coverage for bpf_refcount_acquire() on graph-node-derived pointers. The rejected case passes a popped list node pointer directly to bpf_refcount_acquire(), which must fail because the pointer carries a non-zero fixed offset. Signed-off-by: Yiyang Chen <chenyy23@mails.tsinghua.edu.cn> Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/bf2a2033ced272106292de4465b8ef3fb991c912.1782192383.git.chenyy23@mails.tsinghua.edu.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>