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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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.

-boris

> It's a kernel issue rather than a Xen one BTW.
>
> Ian.
>
> > Kernel is 3.11.2.
> > Xen is 4.2.3.
> >
> > I've seen various random reports of this, but never a follow up on what
> > seemed to be the issue or a fix. The latest was on the ARM platform, but
> > may be a different issue.
> >
> > Has anyone come across these before and found a solution?
> >
> > Xen 4.2.2 seems unaffected.
> >
> > Bug Report:
> > http://xen.crc.id.au/bugs/view.php?id=21
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
>
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