netdev - Re: Soft lockup in inet_put

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Date:   Mon, 12 Dec 2016 13:05:29 -0500
From:   Josef Bacik <jbacik@...com>
To:     Eric Dumazet <eric.dumazet@...il.com>
CC:     Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Tom Herbert <tom@...bertland.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Soft lockup in inet_put_port on 4.6

On Fri, Dec 9, 2016 at 11:14 PM, Eric Dumazet <eric.dumazet@...il.com> 
wrote:
> On Fri, 2016-12-09 at 19:47 -0800, Eric Dumazet wrote:
> 
>> 
>>  Hmm... Is your ephemeral port range includes the port your load
>>  balancing app is using ?
> 
> I suspect that you might have processes doing bind( port = 0) that are
> trapped into the bind_conflict() scan ?
> 
> With 100,000 + timewaits there, this possibly hurts.
> 
> Can you try the following loop breaker ?

It doesn't appear that the app is doing bind(port = 0) during normal 
operation.  I tested this patch and it made no difference.  I'm going 
to test simply restarting the app without changing to the SO_REUSEPORT 
option.  Thanks,

Josef