Subject: Pentium Bug may cause system crash
To: None <current-users@NetBSD.ORG>
From: Markus Illenseer <>
List: current-users
Date: 11/08/1997 15:58:10
 Forwared from a Linux group, are we vulnerable as well? See attached
source code.


Hi folks,

	I'm forwarding something that was posted by a friend to the
Seattle Linux Users mailing list.  FWIW, I tried it on my vanilla P200 as
a regular user and it froze my box solid.  I'm yanking the Pent now for a
Cyrix 6x86 to see if it has the problem also.  I heard a rumor that AMD
K6's were not affected.

B. James Phillippe <bryan@Terran.ORG>
UNIX, Linux, networks, C, Perl, Java, etc.

---------- Forwarded message ----------
Subject: Stops Pentiums dead
Date: Fri, 7 Nov 1997 16:54:46 -0800 (PST)
From: Liem Bahneman <>
To: Linux Mailing List <>

Horrible opcode bug on the pentiums. I hope none of you are pentium-based

char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };
main ()
        void (*f)() = x;


apparent byte code: vx:cmpxchg

locks up any pentium cpu, even from user-space, on any OS.


- liem

Liem Bahneman	                            
Senior Systems Administrator
The Cobalt Group					 (206) 269-6363 x300
Seattle, Washington					F(206) 269-6350


Markus Illenseer