From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jiri Pirko <jiri@resnulli.us>
Subject: ipv6 addrconfg warn_on hit: WARN_ON(ifp->idev->valid_ll_addr_cnt <
 0);
Date: Thu, 16 Jan 2014 14:53:23 +0100
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Hi Hannes.

WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);

We did hit once this warning during the tests. The person who hit this
says that it was during the setup of many macvlan devices.

I examined the code but I'm not sure how this could happen. Looks like a
race condition between addrconf_dad_completed() and addrconf_ifdown(). 
Not sure how to easily resolve that though.

Would you please take a look?

Thanks!

Jiri