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Re: net/core: BUG in unregister_netdevice_many

From Cong Wang <xiyou.wangcong@gmail.com>
Newsgroups linux.kernel
Subject Re: net/core: BUG in unregister_netdevice_many
Date 2017-04-21 21:00 +0200
Message-ID <tyLWF-Sq-9@gated-at.bofh.it> (permalink)
References <tyGaC-5Ri-9@gated-at.bofh.it> <tyLjX-Fc-3@gated-at.bofh.it>
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On Fri, Apr 21, 2017 at 10:25 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Fri, Apr 21, 2017 at 5:48 AM, Andrey Konovalov <andreyknvl@google.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@cn.fujitsu.com>
Date:   Mon Jul 14 20:56:34 2008 -0700

    ipv4: Fix ipmr unregister device oops

    An oops happens during device unregister.

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Re: net/core: BUG in unregister_netdevice_many Linus Torvalds <torvalds@linux-foundation.org> - 2017-04-21 20:30 +0200
  Re: net/core: BUG in unregister_netdevice_many Cong Wang <xiyou.wangcong@gmail.com> - 2017-04-21 21:00 +0200
    Re: net/core: BUG in unregister_netdevice_many David Miller <davem@davemloft.net> - 2017-04-21 21:40 +0200

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