Re: [PATCH] ipv6: Fix soft lockup for ipv6 network notifier.

[Eric Dumazet]

On Wed, 2016-07-06 at 16:15 +0800, Ding Tianhong wrote:
> Hi Ericï
> 
> I had found out that the patch aaf92f(netfilter: conntrack: resched in
> nf_ct_iterate_cleanup) solve the problem, 
> this patch add cond_sched() in the nf_ct_iterate_cleanup() which will
> be called in the net notifier chain every time,
> and I revert this patch at kernel 4.7-rc4 , it will panic for soft
> lockup, so I am not sure whether our patch is need,
> it looks like if I disable the CONFIG for netfilter that would
> register the nf_ct_iterate_cleanup as notifier, the problem still be
> exist.

Well, I do not have conntrack on my kernels, and I can not reproduce the
issue.

So I am guessing other patches also solved a scalability issue, between
4.1 and 4.7

I am aware of something that David did for IPv4, but this might help as
well for IPv6.

commit fbd40ea0180a2d328c5adc61414dc8bab9335ce2
ipv4: Don't do expensive useless work during inetdev destroy.