On Sunday,  4 April 1999 at 15:09:48 +1000, Stephen McKay wrote:
> On Sunday, 4th April 1999, Greg Lehey wrote:
>
>> On Sunday,  4 April 1999 at  1:57:50 +1000, Stephen McKay wrote:
>>> I've just got what seems an unlikely panic.  How could I get a privileged
>>> instruction fault while in kernel mode?
>>
>> Sounds like a hardware (processor) problem to me.  What was the
>> instruction it was trying to execute?
>
> You were distracted by the large amount of extraneous fluff. ;-)  

Oops.

> I wrote:
>
>> The fatal instruction is:
>> 0xc016abc9 <vclean+269>:        movl   $0xc023355c,0xffffffdc(%ebp)
>> which looks pretty ordinary.

Certainly not a privileged instruction.  If the processor gets a
privileged instruction fault on this one, I would say it's wrong.

> What sort of hardware error happens once in 3 months?

This one.

> I often hammer it.  It has done long tape operations before too.  I
> don't want to believe it is hardware yet.

I'd say the truth is staring you in the face.  Don't come too close,
it might grab you.

> I was hoping somebody knew the precise conditions that could produce
> this trap.

I'd guess that you'll never see exactly this trap again.  But I do
recall seeing some other similar ones.

> I think I'll have to cruise the Intel web site and download some big
> pdfs.

Well, at least you'll learn something, but I don't expect you to find
the solution to your problem there.

> Could it be heat?

If it's hot, yes.

Greg
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