Date: Fri, 07 Nov 1997 16:20:35 -0800 From: Julian Elischer <julian@whistle.com> To: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> Cc: "David E. Cross" <dec@phoenix.its.rpi.edu>, hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) Message-ID: <3463B053.2781E494@whistle.com> References: <199711080009.BAA00399@ghost.mep.ruhr-uni-bochum.de>
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Robert Eckardt wrote: > > 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. in 8086 mode, does adding a '0xc3' on the end of the sequence make any difference?
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