Note: If any future in all() fails, the entire all() returns that error. All futures are started concurrently, but a single failure short-circuits the result.
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However, CR0.WP is enabled at boot, and generally remains set for the life of a system. In this case, a page fault will be triggered in response to the write. As more of a tool to facilitate Copy-on-Write than a security boundary, this does not present any real restriction upon the kernel. That said, it does require the inconvenience of fault handling, which would not otherwise be necessary.