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Add a verifier test with one atomic RMW instruction reached through PTR_TO_ARENA and PTR_TO_STACK paths. The verifier must reject the shared instruction with the existing incompatible-pointer diagnostic. Signed-off-by: Yiyang Chen <chenyy23@mails.tsinghua.edu.cn> Link: https://patch.msgid.link/20260816-bpf-next-038-mixed-atomic-v1-v2-2-4644c1886dbc@mails.tsinghua.edu.cn Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>