On Thu, Mar 16, 2017 at 08:08 AM GMT, Kevin Xu wrote: > In some rare cases, inet_sk_rx_dst_set() may be called multiple times > on the same dst, causing reference count leakage. Eventually, it > prevents net_device to be destroyed. The bug then manifested as > > unregister_netdevice: waiting for lo to become free. Usage count = 1 > > in the kernel log, preventing new network namespace creation. > > The patch works around the issue by checking whether the socket already > has the same dst set. > > Signed-off-by: Kevin Xu <kaiwen...@hulu.com> > ---
FWIW, with this patch applied I'm still sometimes seeing: [ 125.928095] unregister_netdevice: waiting for lo to become free. Usage count = 1 -Jakub
