netdev - linux-next: unregister_netdevice: waiting for lo to become free. Usage count = 1

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Message-ID: <CANaxB-z52c-1jqN4fFFECpz1EaDC6B-62WyqtJqNJRiKLhyg7g@mail.gmail.com>
Date:	Tue, 18 Aug 2015 18:24:57 +0300
From:	Andrey Wagin <avagin@...il.com>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org
Subject: linux-next: unregister_netdevice: waiting for lo to become free.
 Usage count = 1

Hello David,

CRIU tests detetect that references on net devices leak on
4.2.0-rc6-next-20150817. Looks like it started with
v4.2-rc6-882-g3bfd847.

David, could you check your changes?

The problem can be reproduced by the following script:
ip netns add test
ip netns exec test ip link set lo up
ip netns exec test ip addr add 1.2.3.4 dev lo
ip netns exec test ip route add 1.2.3.5 dev lo
ip netns exec test ip route add 1.2.3.6 via 1.2.3.5
ip netns del test

You need to execute it twice.

Thanks,
Andrey
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