From owner-freebsd-smp  Tue Apr 29 19:47:59 1997
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Date: Tue, 29 Apr 1997 20:47:42 -0600
From: vanmaren@fast.cs.utah.edu (Kevin Van Maren)
Message-Id: <199704300247.UAA08040@fast.cs.utah.edu>
To: shiba@mxs.meshnet.or.jp, smp@freebsd.org
Subject: Re:  why general protection fault happen on SMP kernel?
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>        GA-686DX
>        P6 180M * 2 (overclocking now(233M))
>        tekram dc-390f
>        asus   sc-200
>        dec    de500-xa

Try running your 180's at 180, and see if you still get the GPF.

Kevin