netdev - Re: net: hang in unregister_netdevice: waiting for lo to become free

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Date:   Tue, 30 Jan 2018 10:32:26 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: hang in unregister_netdevice: waiting for lo to become free

On Tue, Jan 30, 2018 at 4:09 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> Hello,
>
> The following program creates a hang in unregister_netdevice.
> cleanup_net work hangs there forever periodically printing
> "unregister_netdevice: waiting for lo to become free. Usage count = 3"
> and creation of any new network namespaces hangs forever.

Interestingly, this is not reproducible on net-next.