[Bug 195859] Reproduceble panic with VIMAGE + if_bridge

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195859

--- Comment #11 from Hiroki Sato <hrs at FreeBSD.org> ---
Created attachment 151999
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=151999&action=edit
a patch to fix this panic

This patch should fix the panic.  As Bjoern pointed out, ifnet_departure event
on the lo0 interface calls bridge_ifdetach() when destroying a vnet jail.  The
problem is that vnet_bridge_uninit() can be called before it.

The patch uses the fact that a vnet whose V_bridge_cloner == NULL is tearing
down (or not initialized).  I think it is safe to ignore this detach handler in
that case.

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