Date: Fri, 7 Nov 1997 15:00:58 -0600 From: Kenny Hanson <khanson@pdspc.com> To: "FreeBSD Hackers (E-mail)" <freebsd-hackers@FreeBSD.ORG> Subject: FW: Newest Pentium bug (fatal) Message-ID: <91DD7FDA88E4D011BED00000C0DD87E7124C71@pds-gateway.pdspc.com>
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> -----Original Message----- > From: Kenny Hanson > Sent: Friday, November 07, 1997 3:00 PM > To: 'Jim Shankland' > Subject: RE: Newest Pentium bug (fatal) > > This also locks up Win95 OSR2.1 233MMX! Testing NT4.0 right now with > PII 300 :-) > > -----Original Message----- > From: Jim Shankland [SMTP:jas@flyingfox.com] > Sent: Friday, November 07, 1997 2:24 PM > To: hackers@FreeBSD.ORG; julian@whistle.com > Subject: Re: Newest Pentium bug (fatal) > > Yow! > > An old 66 MHz Pentium with the old floating-point bug (remember that > one?): > * sayonara * > > An almost new 166 MHz Pentium MMX: > * adios * > > If this is really the processor halting in its tracks (as opposed to, > say, FreeBSD failing to handle some weird kind of trap), then this > may cost Intel some real money to fix. Compared with the > aforementioned > floating-point bug, this seems like a much bigger deal. > > Jim Shankland > Flying Fox Computer Systems, Inc. > > > Date: Fri, 07 Nov 1997 10:39:24 -0800 > > From: Julian Elischer <julian@whistle.com> > > Organization: Whistle Communications > > MIME-Version: 1.0 > > To: hackers@FreeBSD.ORG > > Subject: Newest Pentium bug (fatal) > > Content-Type: text/plain; charset=us-ascii > > Content-Transfer-Encoding: 7bit > > > > 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. > > > > try the following c program. > > > > > > > > > > unsigned char x[] = { 0xfo, 0x0f, 0xc7, 0xc8 }; > > > > > > main () > > { > > void (*f)(void) = x; > > f(); > > } > > > > > > > > > > We've checked: > > K5... OK > > P6... OK > > P5... *SPLAT* > > > > no idea about the pentium II or other pentium copies. > > K6? > > > > other pentium variants? > > versions? > > > > 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> > > > > > > share and enjoy.. > > > > julian
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