netdev - Re: [PATCH net] net: ipv6: Release route when device is unregistering

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Date:   Wed, 7 Jun 2017 13:14:20 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     David Ahern <dsahern@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: ipv6: Release route when device is unregistering

On Wed, Jun 7, 2017 at 11:26 AM, David Ahern <dsahern@...il.com> wrote:
> Roopa reported attempts to delete a bond device that is referenced in a
> multipath route is hanging:
>
> $ ifdown bond2    # ifupdown2 command that deletes virtual devices
> unregister_netdevice: waiting for bond2 to become free. Usage count = 2
>
> Steps to reproduce:
>     echo 1 > /proc/sys/net/ipv6/conf/all/ignore_routes_with_linkdown
>     ip link add dev bond12 type bond
>     ip link add dev bond13 type bond
>     ip addr add 2001:db8:2::0/64 dev bond12
>     ip addr add 2001:db8:3::0/64 dev bond13
>     ip route add 2001:db8:33::0/64 nexthop via 2001:db8:2::2 nexthop via 2001:db8:3::2
>     ip link del dev bond12
>     ip link del dev bond13
>
> The root cause is the recent change to keep routes on a linkdown. Update
> the check to detect when the device is unregistering and release the
> route for that case.
>
> Fixes: a1a22c12060e4 ("net: ipv6: Keep nexthop of multipath route on admin down")
> Reported-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---

Acked-by: Roopa Prabhu <roopa@...ulusnetworks.com>

This patch fixes the issue for me. Thanks David.