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Date: Wed, 06 Jul 2016 10:44:04 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Ding Tianhong <dingtianhong@...wei.com> Cc: luto@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, Netdev <netdev@...r.kernel.org>, Cong Wang <cwang@...pensource.com> Subject: Re: [PATCH] ipv6: Fix soft lockup for ipv6 network notifier. On Wed, 2016-07-06 at 16:15 +0800, Ding Tianhong wrote: > Hi Eric: > > 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.
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