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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

----- netwiz@xxxxxxxxx wrote:

> 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. 

Just to be clear: this patch is not to make your hang go away: it's a way
for kernel to produce stack trace that will (hopefully) show where the
hang is. So don't get your hopes high that it will fix your problem ;-)


-boris


> Will try and get further results and revert back when I can provide more
> feedback.


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