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SubjectRe: how to determine the cause of kernel lock ups
If you don't mind writing hardware dependent code...

To determine whether you have a bad SIMM I would suggest before the
OS boots. Try writing a set of bits to the address to each SIMM and
then reading them back. Normal sets would be something like:
"0000", "0001", .... "1111". This can take anywhere from a few minutes
to close to an hour depending on the amount of physical memory in
your system.

I hate to say this, but basicly this is what Sun does on all
of their systems with the OpenBootProm code in C for hardware
verification and Forth before you even see the prompt depending
on what is set...

Mitchell Erblich
===================

Hirling Endre wrote:
>
> On Tue, 13 Jul 1999, Petru Paler wrote:
>
> > On Mon, Jul 12, 1999 at 01:40:14PM -0400, Jon 'tex' Boone wrote:
> >
> > > I tried looking through the kernel messages that klogd puts in
> > > syslog, but when the machine locks up, nothing is logged. Rebooting
> > > is enough to start the system working again, although heavy use will
> > > cause it to lock up again.
> > >
> > > Any thoughts?
> >
> > I had the same problem and it was caused by a bad DIMM.
>
> And how do you determine whether your DIMM is bad? I have the above
> problem too - except that it only shows in X -, and I've tried running
> md5sum-s several times or compiling kernel, but those showed no error.
>
> How can one determine _if_ the lockup is caused by bad hardware, and
> if it is, _which_ piece of hardware is bad?
>
> (I have an old Trident 9680, a K6-2/300, 128M RAM, an SMC Ultra ISA
> and an NE2k PCI Ethernet card, two IDE disks and an IDE cd-rom. Nearly
> the same hw worked fine with a 486 dx4-100 w/64M RAM)
>
> greetings
> endre
>
> --
> ..all in all it's just another rule in the firewall.
>
> /Ping Flood/
>
> -
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