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Date:      Mon, 11 Sep 2000 08:36:20 -0700 (PDT)
From:      Matthew Jacob <mjacob@feral.com>
To:        Andrew Gallatin <gallatin@cs.duke.edu>
Cc:        alpha@FreeBSD.ORG
Subject:   Re: so much for *that* idea.....
Message-ID:  <Pine.LNX.4.21.0009110835380.24475-100000@zeppo.feral.com>
In-Reply-To: <14780.62432.185970.793919@grasshopper.cs.duke.edu>

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On Mon, 11 Sep 2000, Andrew Gallatin wrote:
> 
> 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.

Yup- that's a good trick to try.


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

It wasn't delayed- not at all.

-matt




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