[Bug 256610] Kernel panic with ngtee

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256610

--- Comment #6 from John Baldwin <jhb@FreeBSD.org> ---
Ok, I think I'm happy with m_dup always generating a mapped chain then. 
Presumably even if you did unmapped you'd still need to be allocating pages,
etc.  m_dup() already handles jumbo frames suboptimally (perhaps) by degrading
them to a chain of 2k clusters, so duplicating an unmapped mbuf into a chain of
mapped 2k clusters is consistent with that existing behavior.

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