Re: A new K6 bug

Wolfgang Walter (wolfgang.walter@stusta.mhn.de)
Mon, 1 Jun 1998 14:39:12 +0200


On Mon, Jun 01, 1998 at 02:03:13PM +0200, Wolfgang Walter wrote:
> 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.
>

Don't know if this is useful, but for the ATX-boards the power-button did not
work any more, I had to use the reset button or the 'real' power button of the
power pack.

Wolfgang Walter

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