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- 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.
-
-