On Sun, 4 Feb 2018 13:21:18 +0200 Eyal Birger <eyal.bir...@gmail.com> wrote:
> Hi, > > We've encountered a non released device reference upon device > unregistration which seems to stem from xfrm policy code. > > The setup includes: > - an underlay device (e.g. eth0) using IPv4 > - an xfrm IPv6 over IPv4 tunnel routed via the underlay device > - an ipip6 tunnel over the xfrm IPv6 tunnel > > When tearing down the underlay device, after traffic had passed via > the ipip6 tunnel, log messages of the following form are observed: > > unregister_netdevice: waiting for eth0 to become free. Usage count = 2 > > The below synthetic script reproduces this consistently on a fresh > ubuntu vm running net-next v4.15-6066-ge9522a5: Minor correction: net-next version v4.15-10442-g617aebe Eyal.
