[Xen-devel] Re: c/s 23990:1c8789852eaf: xen crashes

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.10.11 at 15:02, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> Hi Christoph,
> 
>>>> On 21.10.11 at 14:29, Christoph Egger <Christoph.Egger@xxxxxxx> wrote:
>> c/s 23990:1c8789852eaf crashes xen due to a NULL pointer dereference
>> within the xen kernel.
> 
> I may have to ask for some debugging help here - obviously I haven't
> seen this on any of my systems, and looking at the code I also fail to
> see how this can happen: handle_hpet_broadcast() gets installed into
> hpet_events->event_handler only after successful allocation of
> hpet_events->cpumask (we're talking about the num_hpets_used == 0
> case here, which again only after the allocation sets HPET_EVT_LEGACY,
> while hpet_legacy_irq_tick() doesn't allow hpet_events->event_handler
> to be called without that flag set). So I'm confused and can't immediately
> help.

I think I can see how this can happen, but I'm still trying to find out
why I don't encounter this. A fix should nevertheless be available
shortly.

Jan


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