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/freebsd-11-stable/sys/kern/
H A Duipc_mbuf.cdiff 282594 Thu May 07 16:51:39 MDT 2015 ae m_dup() is supposed to give a writable copy of an mbuf chain. It uses
m_dup_pkthdr(), that uses M_COPYFLAGS mask to copy m_flags field.
If original mbuf chain has M_RDONLY flag, its copy also will have it.
Reset this flag explicitly.

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