[Bug 198927] if_msk TCP fragmentation causes NFS mount fail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198927

            Bug ID: 198927
           Summary: if_msk TCP fragmentation causes NFS mount fail
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: zaphod at berentweb.com

Created attachment 154831
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154831&action=edit
single packet from Wireshark dump

I'm PXE/diskless booting a Samsung RS40 Laptop. The Diskless root normally gets
mounted by clients as V3 and read-only.

* This is the only NIC among my clients displaying this problem.
* The client gets to the NFS_mount stage, then the if_msk interface keeps
getting toggled up and down, without being able to mount the NFS root.
* Wireshark warns of TCP fragment "New fragment overlaps old data". Attached
single packet as text from Wireshark dump.

Is this an msk(4) problem or some screw-up on my end?

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