netdev - Re: net/core: BUG in unregister_netdevice

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Message-ID: <CAM_iQpUoWzeZPSKTCm13tumvOa7fLMJnz_0F_LSq4odYvWtRaQ@mail.gmail.com>
Date:   Fri, 21 Apr 2017 11:55:04 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        David Ahern <dsa@...ulusnetworks.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        tcharding <me@...in.cc>, Jiri Pirko <jiri@...lanox.com>,
        stephen hemminger <stephen@...workplumber.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/core: BUG in unregister_netdevice_many

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:

commit 7dc00c82cbb0119cf4663f65bbaa2cc55f961db2
Author: Wang Chen <wangchen@...fujitsu.com>
Date:   Mon Jul 14 20:56:34 2008 -0700

    ipv4: Fix ipmr unregister device oops

    An oops happens during device unregister.