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Date:   Wed, 8 Nov 2017 22:34:10 -0800
From:   Cong Wang <>
To:     Fengguang Wu <>
Cc:     Alexander Duyck <>,
        Linus Torvalds <>,
        Jeff Kirsher <>,
        Network Development <>,
        "David S. Miller" <>,
        Linux Kernel Mailing List <>,
        intel-wired-lan <>
Subject: Re: [vlan_device_event] BUG: unable to handle kernel paging request
 at 6b6b6ccf

On Wed, Nov 8, 2017 at 7:12 PM, Fengguang Wu <> wrote:
> Hi Alex,
>> So looking over the trace the panic seems to be happening after a
>> decnet interface is getting deleted. Is there any chance we could try
>> compiling the kernel without decnet support to see if that is the
>> source of these issues? I don't know if anyone on the Intel Wired Lan
>> team is testing with that enabled so if we can eliminate that as a
>> possible cause that would be useful.
> Sure and thank you for the suggestion!
> It looks disabling DECNET still triggers the vlan_device_event BUG.
> However when looking at the dmesgs, I find another warning just before
> the vlan_device_event BUG. Not sure if it's related one or independent
> now-fixed issue.

Those decnet symbols are probably noises.

How do you reproduce it? And what is your setup? Vlan device on
top of your eth0 (e1000)?

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