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From: Peter Samuelson <peter@cadcamlab.org>
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Date: Fri, 8 Dec 2000 11:40:43 -0600 (CST)
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Subject: Re: Signal 11
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[Dick Johnson]
> > >   char main[]={0xf0,0x0f,0xc0,0xc8};    /* try also on NT (: */
> > me2v@reliant DRFDecoder $ ./op
> > Illegal instruction (core dumped)
> 
> Yep. And on early Pentinums, the ones with the "f00f" bug, it would
> lock the machine tighter than a witches crotch. Ooops, not
> politically correct.... It would allow user-mode code to halt the
> machine.

...Until Linux 2.0.34 or so (can't remember the exact version number)
which had the workaround for this bug, about a week after the bug was
discovered.

And I was reminded in private mail that the correct lockup sequence is
actually

  char main[]={0xf0,0x0f,0xc7,0xc8};

where the 0xc8 can be anything from 0xc8 to 0xcf.

Peter
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