linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2

[Dexuan Cui]

Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V 
guest, even
when I didn't configure any NIC for the guest:
 
[   72.604249] unregister_netdevice: waiting for lo to become free. Usage count 
= 2
[   82.708170] unregister_netdevice: waiting for lo to become free. Usage count 
= 2
[   92.788079] unregister_netdevice: waiting for lo to become free. Usage count 
= 2
[  102.808132] unregister_netdevice: waiting for lo to become free. Usage count 
= 2
[  112.928166] unregister_netdevice: waiting for lo to become free. Usage count 
= 2
[  122.952069] unregister_netdevice: waiting for lo to become free. Usage count 
= 2

I don't think this is related to the underlying host, since it's related to 
"lo".

This should be a recent regression, as I remember the January linux-next didn't 
have
this issue.

Any idea?

The gzip-ed kernel config is attached FYI.

Thanks,
-- Dexuan

kernel.config.gz
Description: kernel.config.gz