netdev - Re: [PATCH] netfilter: per netns nf_conntrack

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Date:	Tue, 02 Feb 2010 11:46:32 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Patrick McHardy <kaber@...sh.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep

On Tue, 2010-02-02 at 06:35 -0500, Jon Masters wrote:

> I think there's something more fundamental going on here.

What happens is the conntrack code attempts to free
nf_conntrack_untracked back into the SL[U]B cache from which it
allocates other ct's. There's just one problem...that's a static struct
not from the cache. So, this is why we end up with the SLAB being
corrupted and the address immediately following the
nf_conntrack_untracked being corrupted.

I shoved some debug comments into the destroy code to see if we were
trying to free nf_conntrack_untracked, and bingo. I have shoved a panic
in there now, will send you a backtrace.

Jon.

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