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Re: [Xen-devel] L1[0x1fb] = 0000000000000000 which faults on one type of

To: "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] L1[0x1fb] = 0000000000000000 which faults on one type of machine but on another works?
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Thu, 17 Mar 2011 10:25:11 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, andrew.thomas@xxxxxxxxxx, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, keir.xen@xxxxxxxxx, swente@xxxxxxxxxxxxx, gianni.tedesco@xxxxxxxxxx
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>>> On 16.03.11 at 23:19, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> But one thing I can't understand is why on one machine (IBM x3850)
> I get this crash, while another one with the same pagetable contents
> (L1 has nothing for 0x1fb) it works just fine? I added a panic and used
> the Xen hypervisor kdb to manually inspect the pagetable, and it has
> the same contents as the IBM x3850 -but it boots fine with this invalid 
> value.
> Any ideas?

Without seeing the full stack trace it's hard to tell. To me, it looks
like a mistake for native_apic_read() to be called at all under Xen,
and perhaps there's one lurking somewhere that gets hit only on
those IBM (Summit?) machines.


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