netdev - Re: IPv6 issue in next-20171102 - lockdep and BUG handling RA packet.

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Date:   Mon, 6 Nov 2017 16:31:48 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Valdis Kletnieks <valdis.kletnieks@...edu>,
        "David S. Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: IPv6 issue in next-20171102 - lockdep and BUG handling RA packet.

On Mon, Nov 6, 2017 at 4:29 PM, David Ahern <dsahern@...il.com> wrote:
> On 11/7/17 5:56 AM, valdis.kletnieks@...edu wrote:
>> I've hit this 6 times now, across 3 boots:
>>
>> Nov  3 11:04:54 turing-police kernel: [  547.814748] BUG: sleeping function called from invalid context at mm/slab.h:422
>>
>> Nov  3 20:24:11 turing-police kernel: [   60.093793] BUG: sleeping function called from invalid context at mm/slab.h:422
>> Nov  4 20:20:54 turing-police kernel: [86264.366955] BUG: sleeping function called from invalid context at mm/slab.h:422
>> Nov  5 19:17:40 turing-police kernel: [172469.769179] BUG: sleeping function called from invalid context at mm/slab.h:422
>> Nov  6 06:07:37 turing-police kernel: [211467.239460] BUG: sleeping function called from invalid context at mm/slab.h:422
>>
>> Nov  6 14:12:43 turing-police kernel: [   54.891848] BUG: sleeping function called from invalid context at mm/slab.h:422
>>
>> Something seems to be going astray while handling a RA packet.
>
> Odd. I tested RA before sending the patches and again just now - no
> traceback with an RCU / lock debugging kernel. What is sending the RA's
> in your case? I'd like to understand the config and add a test for this.

Do you have CONFIG_DEBUG_ATOMIC_SLEEP=y in your .config ?