Reported at https://bugzilla.redhat.com/show_bug.cgi?id=449315

In find_appropriate_src():

        hlist_for_each_entry_rcu(nat, n, &bysource[h], bysource) {
                ct = nat->ct;
                if (same_src(ct, tuple)) {

Dereference of ct in same_src() causes the oops. This only seems to
happen on heavily loaded firewall machines. Kernel 2.6.24.7 works.

The reporter identifies commit 4d354c5782dc352cec187845d17eedc2c2bfcf67
("[NETFILTER]: nf_nat: use RCU for bysource hash") as a possible cause
of the problem.
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