On Mon, Sep 29, 2014 at 12:48 PM, Ben Greear [off-list ref] wrote:

We are going to be running up to 20 concurrent scripts that
will be dumping routes & ips, and configuring ip addresses
and routes during bringup.

I don't have a simple stand-alone way to reproduce this,
but at least when we reported the problem is was very easy
for us to reproduce with our tool.

Maybe 20 scripts running in parallel that randomly configured and dumped routes
and ip addresses on random interfaces would do the trick?

I think the most important question is why is this related with macvlan?
IPv6 is L3 while macvlan pure L2, if this is a IPv6 routing bug, it should
not be limited to macvlan.

What does your IPv6 routing table look like? And how do you configure those
macvlan interfaces?