Dear Chris,

I am dead impressed with your technical answer, and I'm not
surprised that it took you weeks to find, well done!

I do have one question though - do you have a fix or
a work-around that will stop the random core dumps on
SuperSPARC Sun4m with the SuperCache? (Sorry to be so
boring!)

Cheers

Rob Goode


> 
> >... SuperCache
> 
> I do believe I finally found the problem.  (There may actually
> be multiple problems, but this is the one that would be causing
> trouble in NetBSD, just as it was in BSD/OS.)
> 
.
. detailed technical description snipped
.
> 
> This took me *weeks* to find... you have to put together about a
> dozen different little bits of information (about the MBus, the
> Ecache, the cache coherence protocols, etc.), but then it all makes
> sense.
> 
> Chris
>