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SubjectRe: unregister_netdevice: waiting for eth0 to become free. Usage count = 1
On Fri, Aug 11, 2017 at 5:31 PM, John Stultz <> wrote:
> On Fri, Aug 11, 2017 at 5:10 PM, Wei Wang <> wrote:
>>> If after Cong's fix, the issue still happens, could you help try the
>>> patch attached and collect all logs when you try the reproduce the
>>> issue? It would be great to have logs for both success case and the
>>> failure case.
>>> Thanks so much for your help.
>> I think we have a potential fix for this issue.
>> Martin and I found that when addrconf_dst_alloc() creates a rt6, it is
>> possible that rt6-> points to loopback device while
>> rt6->rt6i_idev->dev points to a real device.
>> When the real device goes down, the current fib6 clean up code only
>> checks for rt6-> and assumes rt6->rt6i_idev->dev is the same.
>> That leaves unreleased refcnt on the real device if rt6->
>> points to loopback dev.
>> The attached potential fix is tested by Martin and made sure it fixes his issue.
>> John,
>> It will be great if you can also give it a try and see if it fixes the
>> issue on your side before I submit an official patch.
> So yes, sorry I haven't been able to get back quicker on the other
> patches sent, was mucking about in other work.
> So yea, this patch (potential fix for unregister_netdevice()) seems
> to avoid the issue.
> I'm going to do some further testing, but its looking good so far.

Looks good so far! I've not hit the issue yet.

Thanks so much for sorting out a fix!

If its useful:
Tested-by: John Stultz <>

thanks again

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