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Subject: Re: IPv6 issue in next-20171102 - lockdep and BUG handling RA packet.
To: valdis.kletnieks@vt.edu, "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
References: <15801.1510001814@turing-police.cc.vt.edu>
From: David Ahern <dsahern@gmail.com>
Message-ID: <51f7ccd1-6c80-d902-1a19-b885b5f88c24@gmail.com>
Date: Tue, 7 Nov 2017 09:29:25 +0900
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On 11/7/17 5:56 AM, valdis.kletnieks@vt.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.