netdev - Re: Lost network connectivity in 4.0.x

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Date:	Wed, 27 May 2015 22:53:00 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Ken Moffat <zarniwhoop@...world.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Lost network connectivity in 4.0.x

(Please always Cc netdev for networking bugs.)

On Sat, May 23, 2015 at 8:29 PM, Ken Moffat <zarniwhoop@...world.com> wrote:
> On Sun, May 24, 2015 at 03:43:52AM +0100, Ken Moffat wrote:
>> Anybody else suffering frm lost network connectivity in 4.0.x
>> kernels ?  A couple of times this week, vim on an nfs-3 mount hung
>> and I had to reboot.  Both of those occasions were on an AMD desktop
>> with the r8169 driver, running 4.0.3.  I thought it might be
>> specific to that machine.  For the last two or three days I've been
>> using an intel, and about 10 minutes ago it suffered the same problem
>> while running 4.0.4.  Using ping from another term showed that it
>> had no connectivity to the server on my local network.
>>
>> This is a bit hard to diagnose - nothing in the logs.
>>
> I forgot to add that this is with the released gcc-5.1 : I keep
> forgetting that some people use old compilers ;-)
>

Is there any way you can help to narrow down the problem?

For example:

1) What is your network setup? iptables? routes? etc.

2) Can you check the stats to see if there is any error?
  `ip -s -s li show`, `ethtool -S <DEV>`

3) Do a bisect?

Thanks!
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