netdev - ipv6 addrconfg warn_on hit: WARN_ON(ifp->idev->valid_ll_addr

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Message-ID: <20140116135323.GA7961@minipsycho.orion>
Date:	Thu, 16 Jan 2014 14:53:23 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org
Subject: ipv6 addrconfg warn_on hit: WARN_ON(ifp->idev->valid_ll_addr_cnt <
 0);

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
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