netdev - Re: [BUG net-next] infamous dev refcnt leak... again.

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Message-ID: <1439595092.7507.14.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 14 Aug 2015 16:31:32 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [BUG net-next] infamous dev refcnt leak... again.

On Fri, 2015-08-14 at 17:19 -0600, David Ahern wrote:
> On 8/14/15 5:14 PM, Eric Dumazet wrote:
> > On Fri, 2015-08-14 at 14:14 -0700, Eric Dumazet wrote:
> >> While rebooting host running latest net-next
> >>
> >>   unregister_netdevice: waiting for eth0 to become free. Usage count = 4
> >>
> >> Oh well...
> >>
> >
> > It looks like David Ahern recent changes uncover a bug ?
> >
> > Not clear which commit is at fault.
> >
> > Maybe 3bfd847203c6d89532f836ad3f5b4ff4ced26dd9 ?
> >
> > Somehow a down device can be found.
> 
> Can you elaborate on what you are doing to see the refcnt leak? I have 
> not seen that at all. I have to leave for soccer carpool in 45 minutes 
> or so, but can take a look this weekend.

I simply reboot my host. eth0 device can not be dismantled and block the
reboot, I gave to reset the host.

I get the issue every time.

I confirm reverting 3bfd847203c6d89532f836ad3f5b4ff4ced26dd9
removes the issue for me.

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