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	  id BAA00399; Sat, 8 Nov 1997 01:09:03 +0100 (MEZ)
From: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de>
Message-Id: <199711080009.BAA00399@ghost.mep.ruhr-uni-bochum.de>
Subject: Re: Newest Pentium bug (fatal)
In-Reply-To: <Pine.BSF.3.96.971107144655.8219C-100000@phoenix.its.rpi.edu> from "David E. Cross" at "Nov 7, 97 02:49:55 pm"
To: dec@phoenix.its.rpi.edu (David E. Cross)
Date: Sat, 8 Nov 1997 01:09:03 +0100 (MEZ)
Cc: julian@whistle.com, hackers@FreeBSD.ORG
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It was David E. Cross who wrote:
> On Fri, 7 Nov 1997, Julian Elischer wrote:
> 
> > On a "genuine Intel" pentium (not pentium pro)
> > execution of the following sequence, 0xf0 0x0f 0xc7 0xc8
> > 
> > will stop the processor. This is doable from user mode and in 
> > 16bitmode, or in fact any mode.
[...]
> > this one DEFINITLY dies:
> > CPU: Pentium (99.38-MHz 586-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x525  Stepping=5
> >   Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
> > 
> 
> CPU: Pentium (132.96-MHz 586-class CPU)
>   Origin = "GenuineIntel" Id = 0x52c Stepping=12
>   Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
> 
> Just tested OK for me (no crash)

Just tested:
     CPU: Pentium (133.64-MHz 586-class CPU)
       Origin = "GenuineIntel"  Id = 0x52c  Stepping=12
       Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>

It crashes (just lost my most recent mailbox, though I had synced!).
This is 2.2.2-RELEASE.

I also tested DOS-6.2 w/ TurboC-2.0
in 8088/8086-model it still reacts on Numlock and Ctrl-Alt-Del.
in 80186/80286-mode it crashes too.

Robert

-- 
Robert Eckardt                \\ FreeBSD -- solutions for a large universe.(tm)
RobertE@MEP.Ruhr-Uni-Bochum.de \\       What do you want to boot tomorrow ?(tm)
http://WWW.MEP.Ruhr-Uni-Bochum.de/~roberte
For PGP-key finger roberte@gluon.MEP.Ruhr-Uni-Bochum.de