netdev - Re: [PATCH net] ipv4: Avoid caching dsts when lookup skipped nh oif check

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Date:   Thu, 20 Apr 2017 08:21:15 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Robert Shearman <rshearma@...cade.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv4: Avoid caching dsts when lookup skipped nh oif
 check

On 4/20/17 6:58 AM, Robert Shearman wrote:
> David reported that doing the following:
> 
>     ip li add red type vrf table 10
>     ip link set dev eth1 vrf red
>     ip addr add 127.0.0.1/8 dev red
>     ip link set dev eth1 up
>     ip li set red up
>     ping -c1 -w1 -I red 127.0.0.1
>     ip li del red
> 
> results in a hang with this message:
> 
>     unregister_netdevice: waiting for red to become free. Usage count = 1

I think you misunderstood my comment. The above works fine today. There
is no bug with refcnts.

It breaks with your patches wanting to use a VRF device with the main
table (254).