kernel very unstable

> > My stock SuSE 2.2.16 kernel keeps intermittently crashing
> and hosing my
> > machine to where I have to do a hard reboot. It seems to
> generate some kind
> > of oops on the kmem_free function.
>
> In general, any regular crashing by a stock kernel points to hardware
> problems on your end. No kernel that ships with any of the major
> distributions will give these kind of problems on halfway decent
> hardware. In general.

How do I diagnose and fix something like this then?