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Internet Message Format
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1997-11-12
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968b
Path: myrddin.imat.com!miwok!news.scruz.net!kithrup.com!news.Stanford.EDU!agate!howland.erols.net!cs.utexas.edu!geraldo.cc.utexas.edu!not-for-mail
From: noname@noname.com
Newsgroups: comp.os.linux.advocacy
Subject: This code will lock up any P5 machine, even usermode Linux! (F0 0F C7 C8)
Date: Thu, 06 Nov 1997 21:57:33 -0800
Organization: The University of Texas at Austin, Austin, Texas
Lines: 7
Message-ID: <3462ADCD.135B@noname.com>
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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.