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DateMon, 1 Jun 1998 14:03:13 +0200
FromWolfgang Walter <>
SubjectRe: A new K6 bug
On Mon, Jun 01, 1998 at 04:06:22AM +0200, Benoit Poulot-Cazajous wrote:
> 
> The problem reported by andreas@camus.xss.co.at with crashme is really caused 
> by a K6 bug. It can be reproduced at will on 2.0.xx kernels. It looks like
> 2.1.xx kernels hide the bug.
> 
> Here is how to reproduce it :
> 
> $ cat a.s
> 	.text
> 	.align 4096                   /* r1 */
> 	.globl _start
> _start:
>         movl   _start, %edi           /* S1 */
> 	cmpb  0x80000000(%edi),%dl    /* r2, S2 */
> 	je    nowhere                 /* r3 */
> 	ret
> $ as -o a.o a.s
> $ ld -defsym nowhere=0xc0000000 a.o
> $ ./a.out
> <lockup. hard reset required>
> 
>   -- Benoit
> 

Indeed, this little program chrashes all our K6 under linux 2.0.x, even those I
bought 1 week ago. The mainboard, etc doesn't matter at all (we have HX, TX
boards from gigabyte and SP97-V and SP97-XV from asus with SIS chipsets).

Would be very nice if a workaround could be found for 2.0.x.

Wolfgang Walter

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