netdev - Re: unregister_netdevice: waiting for eth0 to become free. Usage count = 1

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Message-ID: <CAEA6p_AkeuT2yNeAYXPMLE70sCo9JmQYe+owNd6eqJEfkoAayg@mail.gmail.com>
Date:   Thu, 10 Aug 2017 13:06:21 -0700
From:   Wei Wang <weiwan@...gle.com>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: unregister_netdevice: waiting for eth0 to become free. Usage
 count = 1

On Thu, Aug 10, 2017 at 11:12 AM, John Stultz <john.stultz@...aro.org> wrote:
> On Wed, Aug 9, 2017 at 10:41 PM, Wei Wang <weiwan@...gle.com> wrote:
>> Hi John,
>>
>> Is it possible to try the attached patch?
>
> Thanks so much for the quick turn around!
>
> So I dropped all the reverts you suggested, and applied this one
> against 4.13-rc4, but I'm still seeing the problematic behavior.
>

Thanks for confirming.
I have been going through the code and not yet found any leaks.
I am also trying to reproduce the issue myself.
Martin seems to also see this issue.
I will continue investigating.

>> I am not sure if it actually fixes the issue. But I think it is worth a try.
>> Also, could you get me all the ipv6 routes when you plug in the usb
>> using "ip -6 route show"? (If you have multiple routing tables
>> configured, could you dump them all?)
>
> # ip -6 route show
> 2601:1c2:1002:83f0::/64 dev eth0  proto kernel  metric 256  expires
> 345599sec pref medium
> fe80::/64 dev eth0  proto kernel  metric 256  pref medium
> default via fe80::200:caff:fe11:2233 dev eth0  proto ra  metric 1024
> expires 1799sec hoplimit 64 pref medium
>
>
> After unplugging the device (and getting the unregister_netdevice errors):
> # ip -6 route show
> #
>

Thanks for the logs.


>
> thanks
> -john