※推測ですが、4.1.0.RLQ1の linux kernel versionと VirtualBoxの loadable moduleの
compileされた kernel versionが一致してないんじゃないでしょうか?
[ 214.747992] vboxnetflt: disagrees about version of symbol skb_copy_bits
[ 214.754660] vboxnetflt: Unknown symbol skb_copy_bits (err -22)
[ 214.760517] vboxnetflt: disagrees about version of symbol skb_put
[ 214.766665] vboxnetflt: Unknown symbol skb_put (err -22)
[ 214.771997] vboxnetflt: disagrees about version of symbol dev_queue_xmit
[ 214.778710] vboxnetflt: Unknown symbol dev_queue_xmit (err -22)
[ 214.784652] vboxnetflt: disagrees about version of symbol dev_add_pack
~以下略~