linux-kernel - Re: [PATCH] [RFC] netfilter: nf_conntrack: don't relase a conntrack with non-zero refcnt

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Message-ID: <20140116092301.GF28205@breakpoint.cc>
Date:	Thu, 16 Jan 2014 10:23:01 +0100
From:	Florian Westphal <fw@...len.de>
To:	Andrew Vagin <avagin@...allels.com>
Cc:	Florian Westphal <fw@...len.de>, Andrey Vagin <avagin@...nvz.org>,
	netfilter-devel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	netfilter@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, vvs@...nvz.org,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Vasiliy Averin <vvs@...allels.com>
Subject: Re: [PATCH] [RFC] netfilter: nf_conntrack: don't relase a conntrack
 with non-zero refcnt

Andrew Vagin <avagin@...allels.com> wrote:
> > I think it would be nice if we could keep it that way.
> > If everything fails we could proably intoduce a 'larval' dummy list
> > similar to the one used by template conntracks?
> 
> I'm not sure, that this is required. Could you elaborate when this can
> be useful?

You can dump the lists via ctnetlink.  Its meant as a debugging aid in
case one suspects refcnt leaks.

Granted, in this situation there should be no leak since we put the newly
allocated entry in the error case.

> Now I see only overhead, because we need to take the nf_conntrack_lock
> lock to add conntrack in a list.

True. I don't have any preference, I guess I'd just do the insertion into the
unconfirmed list when we know we cannot track to keep the "unhashed"
bug trap in the destroy function.

Pablo, any preference?
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