=== DF-2587 UNPATCHED: ng_ether + harness(IFP2NG(vtnet0)=NULL) + ping ===
kldload ng_ether; kldload df2587_harness.ko  (sets IFP2NG(vtnet0)=NULL)
ping -c1 10.0.2.2  -> kernel PANIC

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x28
instruction pointer   = 0x8:0xffffffff82600247
current process       = Idle
Stopped at ng_ether_output+0x7: movq 0x28(%rax),%rax