netdev - Re: netlink & rhashtable status

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Message-ID: <20150514050325.GA5754@gondor.apana.org.au>
Date:	Thu, 14 May 2015 13:03:25 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, Thomas Graf <tgraf@...g.ch>,
	netdev <netdev@...r.kernel.org>
Subject: Re: netlink & rhashtable status

On Wed, May 13, 2015 at 09:38:41PM -0700, Eric Dumazet wrote:
>
> And only one of the socket is listed twice (ffff881f6eceb000)
> 
> Apparently this is the one _after_ kernel socket.
> 
> Does it ring a bell ?

No that's just a walker bug.  In netlink_seq_next when we come
around the loop after ++i, we fail to refresh the ht pointer so
we walk the previous table again.

This bug was introduced in 3.18:

commit 78fd1d0ab072d4d9b5f0b7c14a1516665170b565
Author: Thomas Graf <tgraf@...g.ch>
Date:   Tue Oct 21 22:05:38 2014 +0200

    netlink: Re-add locking to netlink_lookup() and seq walker

This should have zero impact on functionality though.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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