On Mon, 2017-08-14 at 18:19 +0200, Jesper Dangaard Brouer wrote: > The output (extracted below) didn't show who called 'do_raw_spin_lock', > BUT it showed another interesting thing. The kernel code > __dev_queue_xmit() in might create route dst-cache problem for itself(?), > as it will first call skb_dst_force() and then skb_dst_drop() when the > packet is transmitted on a VLAN. > > static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) > { > [...] > /* If device/qdisc don't need skb->dst, release it right now while > * its hot in this cpu cache. > */ > if (dev->priv_flags & IFF_XMIT_DST_RELEASE) > skb_dst_drop(skb); > else > skb_dst_force(skb);
This is explained in this commit changelog. https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=93f154b594fe47e4a7e5358b309add449a046cd3