kernel BUG at net/netfilter/nf_nat_core.c:395

From: Oleksandr Natalenko
Date: Wed Feb 10 2016 - 12:34:48 EST


Hi.

With 4.4.1 I've got BUG_ON() triggered in net/netfilter/nf_nat_core.c:395,
nf_nat_setup_info(), today on my home router.

Here is full trace got via netconsole: [1]

I perform LAN NATting using nftables like this:

===
table ip nat {
chain prerouting {
type nat hook prerouting priority -150;
}

chain postrouting {
type nat hook postrouting priority -150;

oifname enp2s0 ip saddr 172.17.28.0/24 counter snat 1.2.3.4
oifname enp2s0 ip saddr 172.17.29.0/24 counter snat 1.2.3.4
oifname enp2s0 ip saddr 172.17.31.0/24 counter snat 1.2.3.4
oifname enp2s0 ip saddr 172.17.35.0/24 counter snat 1.2.3.4
oifname enp2s0 ip saddr 172.17.37.0/24 counter snat 1.2.3.4
oifname tun0 ip saddr 172.17.28.0/24 counter masquerade
oifname tun0 ip saddr 172.17.29.0/24 counter masquerade
oifname tinc0 ip saddr 172.17.28.0/24 counter masquerade
oifname tinc0 ip saddr 172.17.29.0/24 counter masquerade
}
}
===

Traffic filtering is done via nftables as well.

Ideas? What could I do to debug the issue better?

[1] https://gist.github.com/bbb3712f40a7753537fe