netdev - Re: net/core: BUG in unregister_netdevice

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Message-Id: <20170421.153840.2181333362371190008.davem@davemloft.net>
Date:   Fri, 21 Apr 2017 15:38:40 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     torvalds@...ux-foundation.org, andreyknvl@...gle.com,
        edumazet@...gle.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexander.h.duyck@...el.com,
        dsa@...ulusnetworks.com, daniel@...earbox.net, me@...in.cc,
        jiri@...lanox.com, stephen@...workplumber.org, dvyukov@...gle.com,
        kcc@...gle.com, syzkaller@...glegroups.com
Subject: Re: net/core: BUG in unregister_netdevice_many

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Fri, 21 Apr 2017 11:55:04 -0700

> On Fri, Apr 21, 2017 at 10:25 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> On Fri, Apr 21, 2017 at 5:48 AM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>>>
>>> I've got the following error report while fuzzing the kernel with syzkaller.
>>>
>>> ------------[ cut here ]------------
>>> kernel BUG at net/core/dev.c:6813!
>>
>> Another useless BUG_ON() that
> 
> I think we are double-unregister'ing the pim6reg device,
> we probably need something like:

This particular bug is fixed by Nikolay's fix.

I'm not saying you haven't spotted another bug.