Date: Sat, 8 Nov 1997 01:09:03 +0100 (MEZ) From: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> To: dec@phoenix.its.rpi.edu (David E. Cross) Cc: julian@whistle.com, hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) Message-ID: <199711080009.BAA00399@ghost.mep.ruhr-uni-bochum.de> 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"
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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
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