[Bug 233622] panic: page not present fault when stopping VIMAGE jail on 12.0-RC2, netgraph

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233622

--- Comment #2 from Jordan Boland <jordantboland at live.com> ---
Yes, I can go into some more detail about the networking.

On the host system, only igb1 is currently active.  It is a trunk interface, so
on the host I have igb1.1 configured.

I am utilizing Devin Teske's jng to create a netgraph bridge to igb1, exposing
the trunked interface to the jail.  This jail only needs 1 VLAN, but I
anticipate adding others later that will utilize more, and this seemed more
elegant than cloning the VLAN interfaces individually.

In the jail, I am replicate the same setup as the host to access the tagged
interface.

host rc.conf:
=============================
ifconfig_igb1="up"
vlans_igb1="1"
ifconfig_igb1_1="192.168.1.2 netmask 255.255.255.0"
=============================


jail rc.conf:
=============================
vlans_ng0_unifi="1"
ifconfig_ng0_unifi="up"
ifconfig_ng0_unifi_1="inet 192.168.1.3 netmask 255.255.255.0"
=============================


For this particular jail the configuration is overkill (I suppose I could just
bridge to igb1.1 on the host).  But I am proving out this strategy for some of
the other services that I will need to host on this machine later.  Otherwise,
I will have to go back to the strategy of mangling multiple FIBs.

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