The panic appears to be fixed upstream via:
Author: Liping Zhang <zlpnob...@gmail.com>
Date: Sat Mar 25 16:35:29 2017 +0800
netfilter: nf_ct_ext: fix possible panic after
If one cpu is doing nf_ct_extend_unregister while another cpu is doing
__nf_ct_ext_add_length, then we may hit BUG_ON(t == NULL). Moreover,
there's no synchronize_rcu invocation after set nf_ct_ext_types[id] to
NULL, so it's possible that we may access invalid pointer.
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Creating conntrack entry failure with kernel 4.4.0-89
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