[Bug 227654] [panic] repeatable crash with lagg+vlan+em

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227654

--- Comment #5 from Eugene Grosbein <eugen at freebsd.org> ---
I've added additional printf's to sys/net/if_ethersubr.c and found that it
panices within ether_output_frame() function.

I've added this just before PFIL_HOOKED(&V_link_pfil_hook) check:

if (ifp->if_index == 6) printf(""ether_output_frame: checking curvnet=%p\n",
curvnet);
if (ifp->if_index == 6) printf(""ether_output_frame: V_link_pfil_hook=%p\n",
V_link_pfil_hook);

And last lines of dmesg buffer after panic are:

ether_output_frame: checking curvnet=0
panic: vm_fault_hold: fault on nofault entry, addr: 0

So, curvnet is NULL here, hence the panic.

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