Re: [Xen-devel] Re: [patch] xenfb: fix xenfb suspend/resume race
From: Konrad Rzeszutek Wilk
Date: Mon Jan 03 2011 - 11:34:44 EST
> > I am unclear from your description whether the patch fixes
> > the problem (I would presume so). Or does it take a long time
> > to hit this race?
> Yes, more than 100 migrations. we hit this issue around 3 times.
OK, so you are still trying to find the culprit.
Did you look at this patch from Ian:
> I dumped vmcore when guest crashed, from vmcore everything
> looked good, fb_info, xenfb_info and so on.
And the event channels are correct?
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index ac7b42f..4cfb5e2 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -175,6 +175,8 @@ static struct irq_info *info_for_irq(unsigned irq)
> static unsigned int evtchn_from_irq(unsigned irq)
> + if (unlikely(irq < 0 || irq >= nr_irqs))
> + return 0;
You could insert a WARN_ON here to see see if you get this during your
Or use xen_raw_printk in case the guest is hung for good.
> return info_for_irq(irq)->evtchn;
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