From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: 4.6.3 panic on nf_ct_delete (nf_conntrack)
Date: Wed, 13 Jul 2016 22:21:13 +0200
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References: <df376f88504cb0f20b20acf42962c16d@nuclearcat.com>
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nuclearcat@nuclearcat.com <nuclearcat@nuclearcat.com> wrote:
> Workload: pppoe server, 5k users on ppp interfaces. No actual SNAT/DNAT, but
> using connmark and REDIRECT
> 
> [176412.990104] general protection fault: 0000 [#1]
> SMP

I assume that you did not see this before.

What was the last kernel version where you did not run into this?

Might help to narrow things down.