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Date:	Tue, 02 Feb 2010 17:48:22 +0100
From:	Patrick McHardy <>
To:	Jon Masters <>
CC:	Eric Dumazet <>,
	Alexey Dobriyan <>,
	linux-kernel <>,
	netdev <>,
	netfilter-devel <>,
	"Paul E. McKenney" <>
Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep

Jon Masters wrote:
> 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.

That shouldn't happen, the untracked conntrack is initialized to a
refcount of 1, which is never released.

> 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.

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