netdev - Re: VRF/IPv4/ARP: unregister_netdevice waiting for dev to become free -> Who's responsible for releasing dst_entry created by ip_route_input

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Message-ID: <373ad07f-71c9-a10d-d870-5e9a2c8a8502@gmail.com>
Date:   Sat, 5 Jun 2021 12:56:58 -0600
From:   David Ahern <dsahern@...il.com>
To:     Oliver Herms <oliver.peter.herms@...il.com>,
        Network Development <netdev@...r.kernel.org>
Cc:     David Miller <davem@...emloft.net>
Subject: Re: VRF/IPv4/ARP: unregister_netdevice waiting for dev to become free
 -> Who's responsible for releasing dst_entry created by ip_route_input_noref?

On 6/5/21 11:16 AM, Oliver Herms wrote:
> Hi everyone,
> 
> I'm observing an device unregistration issue when I try to delete a VRF interface after using the VRF.
> The issue is reproducible on 5.12.9, 5.10.24, 5.11.0-18 (debian).
> 
> Here are the steps to reproduce the issue:
> 
> ip addr add 10.0.0.1/32 dev lo
> ip netns add test-ns
> ip link add veth-outside type veth peer name veth-inside
> ip link add vrf-100 type vrf table 1100
> ip link set veth-outside master vrf-100
> ip link set veth-inside netns test-ns
> ip link set veth-outside up
> ip link set vrf-100 up
> ip route add 10.1.1.1/32 dev veth-outside table 1100
> ip netns exec test-ns ip link set veth-inside up
> ip netns exec test-ns ip addr add 10.1.1.1/32 dev veth-inside
> ip netns exec test-ns ip route add 10.0.0.1/32 dev veth-inside
> ip netns exec test-ns ip route add default via 10.0.0.1
> ip netns exec test-ns ping 10.0.0.1 -c 1 -i 1
> sleep 10
> ip link set veth-outside nomaster
> ip link set vrf-100 down
> ip link delete vrf-100 <= Never returns
> 

thanks for the quick reproducer; I will take a look.