[Bug 247647] panic: page fault when opening netmap port (vmxnet3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247647

            Bug ID: 247647
           Summary: panic: page fault when opening netmap port (vmxnet3)
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: zlei.huang at gmail.com

Observed this on FreeBSD 12.1-RELEASE-p6 but not FreeBSD 12.1-RELEASE.

Environment:
 - VMware Fusion 11.5.3
 - FreeBSD 12.1-RELEASE-p6 amd64 VM with vmxnet3 interface

Steps to reproduce:
 1. Boot VM
 2. tcpdump -ni netmap:vmx0

This is repeatable.

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