`–load-mode` refactor (#20834) removed the only safe combo for `–n-cpu-moe` CPU-offload: “no mmap, but pin the CPU-resident tensors”

此报错发生在使用 --n-cpu-moe CPU 卸载配合 --no-mmap --mlock (或等价的 --load-mode mlock )时,因 --load-mode 重构 #20834 导致 mlock 强制隐含 mmap ,引发双缓冲 OOM 或 --load-mode none 下无

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