From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: open sockets preventing unregister_netdevice from completing
 in linux-next (next-20120724)
Date: Wed, 25 Jul 2012 15:17:37 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 25 Jul 2012 16:38:48 +0200

> Yes, we miss what was done with rt_cache_flush() : find all cached
> routes and release all dev references...

We can fix this with a two-pronged approach:

1) Walk the FIB info nexthops and invalidate.

2) Entries not cached in the FIB info nexthops go into a
   per-netns list which is scanned as well.

I'll try to work on this if nobody beats me to it.