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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Mon, 11 Sep 2000 11:08:13 -0400 (EDT)
To: mjacob@feral.com
Cc: alpha@FreeBSD.ORG
Subject: Re: so much for *that* idea.....
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Matthew Jacob writes:
 > 
 > I did a build from more or less top of tree- I had had a clean buildworld, so
 > I built a kernel and did the installworld and did mergemaster and did
 > disklabel -B, and got:

<...>

 > halt code = 2
 > kernel stack not valid halt
 > PC = 200000000       
 > 
 > for my pains. Tsk.

This typically means you're faulting very early in the boot process.
Thus is typically caused by trap'ing & then calling vm_map_lookup()
out of vm_fault() prior to setting up the vm maps.  The
vm_map_lookup() faults & you get caught in an infinate recursion
ending in a ksp not valid.

First thing I'd try is temporarily making the ALPHA_MMCSR_ACCESS case
in trap() always fatal for a kernel-mode trap.  This should catch the
initial trap & give you a clue as to what's going wrong.

Sorry for my delayed reply.  My wife & I just moved into our new
place.  No phone service yet, much less DSL.   Blah.

Drew




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