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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: Fix IP_MULTICAST_IF
Date: Mon, 19 Oct 2009 21:20:18 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 20 Oct 2009 06:07:48 +0200

> Final target might be fine, but an element in the chain, before target
> could be deleted while reader scans hash chain.
 ...
> So it should visit a nice memory location ?

It should hit a NULL eventually and deterministically even if an
unlink happens at the same time..... unless the object gets free'd
meanwhile, hmmm...

This code is definitely intentional, I remember when I added it to
the tree, Alexey wrote it :-)