[ LUGOS ] WARNING: Intel Pentium Bug (fwd)

[Edi Suc]

Hi.

Ce vas zanima tisti bug si oglejte forward in stvar melce stestirajte.
lp,
Edi


---------- Forwarded message ----------
Date: Fri, 7 Nov 1997 19:29:34 +0100 (MET)
From: Damjan Lampret <Damjan.Lampret na arnes.si>
To: vdori na dl.arnes.si
Subject: WARNING: Intel Pentium Bug (fwd)

Howdy!

Tole sem preveril na P200 in na Cyrix 150 (alias P200+), na prvem pod
Win95, na drugem pod WinNT. V prvem primeru stvar dela oz. bolje receno
zmrzne, v drugem NTji ujamejo Invalid opcode. Nisem poskusil pod recimo
Linuxom, ker je na tisti masini v tistem trenutku prevec ljudi delalo na
njem ;-).

--damjan

Date: Thu, 06 Nov 1997 21:57:33 -0800
From: noname na noname.com
Newsgroups: comp.os.linux.advocacy
Subject: This code will lock up any P5 machine, even usermode Linux!  (F0 0F C7 C8)

Hi,

        Check this out.  If you execute F0 0F C7 C8 on a P5 it will lock the
machine up.  This is true for any operating system including usermode
Linux.  It's pretty cool.  Basically, the opcodes are an invalid form of
cmpxchg8b eax with a lock prefix.  Has anyone seen this before?  The
problem doesn't show itself for the Pentium Pro or Pentium 2.

>From root na zombie.nws.net Fri Nov  7 03:05:53 1997
Date: Fri, 07 Nov 1997 03:04:57 +0000
From: "root of all evil (ZombieMan)" <root na zombie.nws.net>
To: root na zombie
Subject: [Fwd: F0 0F C7 C8 looks worse than FPIV]



Date: 7 Nov 1997 07:17:44 GMT
From: Sam Trenholme <set-usenet-878887265 na reality.samiam.org>
Newsgroups: comp.os.linux.advocacy, comp.sys.intel
Subject: F0 0F C7 C8 looks worse than FPIV

>Cool.  It also works (sic) from V86 mode, so if you want to play around, just
>use DOS debug under whatever DOS emulator the OS you are using provides.
>Anyone try it on a Pentium MMX?

This bug looks far worse that FPIV.  Intel will probably be forced to
undergo an expensive recall, although I wonder just how Intel plans on
getting the broken Pentium on my IBM thinkpad fixed.  I like to let
co-workers access my machine when it is hooked up to the network at work,
and will have to now severely restrict any such access.

- Sam