From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Subject: Re: "net: remove sock_iocb" breaks ip tool - "Cannot send dump
	request : Connection refused"
Date: Thu, 5 Feb 2015 10:41:35 +0100
Message-ID: <20150205094135.GA2576@lst.de>
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Cc: "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org
To: Alban Browaeys <alban.browaeys@gmail.com>
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On Thu, Feb 05, 2015 at 10:36:01AM +0100, Alban Browaeys wrote:
> "ip a" returns "Cannot send dump request : Connection refused" until I
> revert commit 7cc05662682d ("net: remove sock_iocb").
> This as root or as user.
> 
> NetworkManager is affected too.
> 
> Could siocb cache the cookie ? 

Ca you strace what syscall on what socket causes that return?