From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: Linux kernel error stack
Date: Sun, 5 Aug 2018 22:02:54 +0200
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Cc: Florian Westphal <fw@strlen.de>, netdev@vger.kernel.org
To: Satish Patel <satish.txt@gmail.com>
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Satish Patel <satish.txt@gmail.com> wrote:
> > [84166:59495417] -A POSTROUTING -p tcp -m tcp --sport 80 -j CHECKSUM
> > --checksum-fill
> > [68739:5153476] -A POSTROUTING -p tcp -m tcp --sport 8000 -j CHECKSUM
> > --checksum-fill

These rules make no sense to me, and are also source of your backtrace.
Who set this up?

If this is coming from openstack, I suggest asking openstack developers
WTH this is supposed to do.

> > [755:275452] -A POSTROUTING -s 10.0.3.0/24 -o lxcbr0 -p udp -m udp
> > --dport 68 -j CHECKSUM --checksum-fill

This was needed to work around dhcpd issues w. checksum offloading but I
guess that DCHCP will work fine without this rule too nowadays.

So I suggest you simply get rid of these rules.