Re: A new K6 bug
Wolfgang Walter (wolfgang.walter@stusta.mhn.de)
Mon, 1 Jun 1998 14:03:13 +0200
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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