netdev - Re: [REGRESSION] 5.0-rc2: iptables -nvL consumes 100% of CPU and hogs memory with kernel 5.0-rc2

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Message-ID: <20190115101519.pf7ogpvdz22wku7g@breakpoint.cc>
Date:   Tue, 15 Jan 2019 11:15:19 +0100
From:   Florian Westphal <fw@...len.de>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Martin Steigerwald <martin@...htvoll.de>
Subject: Re: [REGRESSION] 5.0-rc2: iptables -nvL consumes 100% of CPU and
 hogs memory with kernel 5.0-rc2

Michal Kubecek <mkubecek@...e.cz> wrote:
> > I upgraded to self-compiled 5.0-rc2 today and found the machine to be slow
> > after startup. I saw iptables consuming 100% CPU, it only responded to
> > SIGKILL. It got restarted several times, probably by some systemd service.
> > 
> > Then I started 'iptables -nvL' manually. And I got this:
> > 
> > % strace -p 5748
> > [… tons more, in what appeared an endless loop …]

This is fixed by:

http://patchwork.ozlabs.org/patch/1024772/
("netfilter: nf_tables: Fix for endless loop when dumping ruleset").