Re: [Xen-devel] 4.2.3 - xen: vector 0x2 is not implemented

[Steven Haigh <netwiz@xxxxxxxxx>]

On 9/10/2013 12:53 PM, Boris Ostrovsky wrote:
> 
> ----- netwiz@xxxxxxxxx wrote:
> 
>> On 9/10/2013 2:56 AM, Boris Ostrovsky wrote:
>>> On 10/08/2013 10:41 AM, Steven Haigh wrote:
>>>> On 10/09/2013 01:31 AM, Boris Ostrovsky wrote:
>>>>> On 10/08/2013 08:42 AM, Ian Campbell wrote:
>>>>>> On Tue, 2013-10-08 at 10:50 +1100, Steven Haigh wrote:
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've had a report of a host starting to give this output:
>>>>>>> Oct 7 19:36:37 kernel: INFO: rcu_sched self-detected stall on
>> CPU { 2}
>>>>>>> (t=273561 jiffies g=17919 c=17918 q=9688)
>>>>>>> Oct 7 19:36:37 kernel: sending NMI to all CPUs:
>>>>>>> Oct 7 19:36:37 kernel: xen: vector 0x2 is not implemented
>>>>>> This bit is just a symptom triggered by the initial rcu stall
>> which is
>>>>>> your real problem.
>>>>>>
>>>>>> That said I thought the NMI thing was fixed recently, which might
>> have
>>>>>> gotten you better debugging on the rcu problem.
>>>>> This went into v3.12-rc1 (commit 6efa20e).
>>>>>
>>>>> Steven, can you try your test with newer kernels that have this
>> fix?
>>>>> With
>>>>> it we should be able to see where the stall is happening.
>>>> Sadly I can't easily rebuild this to 3.12. Is it possible to get a
>>>> version / patch / commit that will work with 3.11.x?
>>>
>>> I am not sure I understand what you are asking for. A backport of
>> the
>>> patch to 3.11.x so that you apply it on top of your sources and
>> build it
>>> yourself?
>>
>> Correct. I have a buildroot set up for building 3.11.x into RPMs that
>> would take a lot of work to change to 3.12. As this is a problem with
>> 3.11 as well (as I don't run or provide 3.12 anywhere), I'd like to
>> test
>> the fix on 3.11.
> 
> I am attaching the patch to 3.11.4 (which is exactly the same as the one
> that went into 3.12 btw). I only compile-tested it to make sure that it 
> builds.
> 
>>
>> Eventually, it will need to be fixed in the 3.11 series as well.
>>
> 
> It's unlikely to go into 3.11 since it's really a new feature and not a bug 
> fix.

Thanks, I'll test this and see what I can turn up. The problems are
happening in 3.11.2 at this stage - which causes the system to become
unresponsive and a load of 45+. It also causes network traffic to stop.

As such, it should probably be looked at as a bugfix for 3.11. Will try
and get further results and revert back when I can provide more feedback.

-- 
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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