Subject: Re: panic: ptdi foo
To: Darren Reed <darrenr@cyber.com.au>
From: Robert V. Baron <rvb@gluck.coda.cs.cmu.edu>
List: port-i386
Date: 03/04/1998 13:00:51
This is a vm bug in 1.2 and 1.3.  The pmap should allocate
pde's when needed; it doesn't, rather the trap() code does.
So, if you have a case where pages are wired (for raw access),
you do not go thru trap() and do not create the pde's and you
lose.
Hints: Use a smaller bs, that way you are much less likely
crossing over into vm w/o an allocate pde.  (A pde spans 4Meg.)