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

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Message-ID: <CALAqxLUoV6EQvofTEv9whW1_QMPBPU7eJBhRFUjaSs7CGeRFww@mail.gmail.com>
Date:   Thu, 10 Aug 2017 11:12:11 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Wei Wang <weiwan@...gle.com>
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>
Subject: Re: unregister_netdevice: waiting for eth0 to become free. Usage
 count = 1

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.

> 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
-john