Re: A new K6 bug. Re: Some more data-points for "crashme"

Alessandro Suardi (asuardi@uninetcom.it)
Sun, 31 May 1998 19:18:46 +0200

Andreas Haumer wrote:
>
> Hi!
>
> Benoit Poulot-Cazajous wrote:
> >
> > > This is the main reason I think the crashes I see must have
> > > something to to with the illegal CPU opcodes "crashme" executes,
> > > and not with general system instability.
> >
> > I have also tried crashme on my K6 (step 2) and found, after many tries, that
> > 'crashme +2000 18268 100' crashes the system instantaneously if and only if
> > the kernel version is <= 2.1.42. The problem disappear with a Cyrix P200+.
> >
> I also have found a way to reproduce the crash by calling crashme that
> way:
>
> % crashme +2000.0 3306 100 12:00:00 3
>
> I have tried it 3 times now, and the system always hung immediately
> after executing the above command!
> It seems to be machine dependent, though. I can only reproduce it with
> seed 3306 on system #1 (K6-233, 256MB RAM, Linux-2.0.34pre16, kernel
> without APM configuration!).
> I'll check if I can find a similar "100% crash seed" on the other
> systems, too.
>

AMD K6-200 with bus speed set to 75Mhz (225Mhz CPU speed) running 2.0.34pre16
currently with either test above, no problem. RAM is 64MB SDRAM 10ns.

[asuardi@dogbert asuardi]$ ps -ef|grep crashme
asuardi 997 295 0.2 19:13:04 p0 00:00:39 ./crashme +2000 18268 100 1
asuardi 1462 997 99.9 19:15:30 p0 00:11:26 ./crashme +2000 18725 100 4
[asuardi@dogbert asuardi]$ cat /proc/cpuinfo
processor : 0
cpu : 586
model : 6
vendor_id : AuthenticAMD
stepping : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
fpu : yes
fpu_exception : yes
cpuid : yes
wp : yes
flags : fpu vme de pse tsc msr mce cx8 mmx
bogomips : 448.92
[asuardi@dogbert asuardi]$ date
Sun May 31 19:15:46 MET DST 1998
[asuardi@dogbert asuardi]$ cat /proc/version
Linux version 2.0.34 (asuardi@dogbert) (gcc version 2.7.2.3) #6 Sun May 31 18:42:48 MET DST 1998

--alessandro <asuardi@uninetcom.it> <asuardi@it.oracle.com>

Linux 2.0.33/2.1.103 libc-5.4.44 gcc-2.8.1 binutils-2.9.1.0.6

"Expectations only mean you really think you know
what's coming next, and you don't" -- Husker Du

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