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/dev/zero is commonly used to allocate anonymous memory, it is a very good file for tests, let's prepare it. Suggested-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/lkml/20230702193306.GK16233@1wt.eu/ Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>