[Bug 239224] Virtual Interface: Not Working in Netmap Mode on 11.3 STABLE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239224

            Bug ID: 239224
           Summary: Virtual Interface: Not Working in Netmap Mode on 11.3
                    STABLE
           Product: Base System
           Version: 11.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: halfling at halfling.com.br

Hello!

I was trying to update my servers from FreeBSD 11.2-STABLE to 11.3-STABLE and
first a tested Netmap on top of 11.3-STABLE. My application did a Kernel Panic
on my first try.

First I thought my application was wrong so I tried netmap/apps in Virtual
Interfaces like(VLAN/TAP/TUN):

pkt-gen -f rx -i vlan5 (Kernel Panic. Server reboot)
pkt-gen -f rx -i tap5 (Kernel Panic. Server reboot)
pkt-gen -f rx -i tun5 (Kernel Panic. Server reboot)

vale-ctl -h vale0:vlan5 (Kernal Panic. Server reboot)
vale-ctl -h vale0:tap5 (Kernal Panic. Server reboot)
vale-ctl -h vale0:tun5 (Kernal Panic. Server reboot)

So I tried with tcpdump:
tcpdump -eni netmap:vlan5 (Kernal Panic. Server reboot)
tcpdump -eni netmap:tap5 (Kernal Panic. Server reboot)
tcpdump -eni netmap:tun5 (Kernal Panic. Server reboot)

This tests is full working in my FreeBSD 11.2-STABLE, but is not working in
FreeBSD 11.3-STABLE

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