2017-11-07 00:38:41

by David Ahern

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

On 11/7/17 5:56 AM, [email protected] 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.

From 1583365497963974370@xxx Tue Nov 07 00:36:48 +0000 2017
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2017-11-07 00:33:17

by Eric Dumazet

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

On Mon, Nov 6, 2017 at 4:29 PM, David Ahern <[email protected]> wrote:
> On 11/7/17 5:56 AM, [email protected] 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 ?

From 1583360323702395980@xxx Mon Nov 06 23:14:34 +0000 2017
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