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Date: Wed, 22 Apr 2009 22:41:10 +0200
From: Andreas Tobler <andreast-list@fgznet.ch>
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To: Marcel Moolenaar <xcllnt@mac.com>, freebsd-ppc@freebsd.org
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Subject: Re: Fatal kernel trap during boot 8.0-CURRENT
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Marcel Moolenaar wrote:
> 
> On Apr 16, 2009, at 9:53 AM, Andreas Tobler wrote:
>>> I could repeat this several times.
>>> Then I booted my old 7.1 kernel without problems.
>>> After that I also could boot 8.0 again.
>>
>> Fyi, I experience the same on my imac G3. And I use the same procedure 
>> to get back to -CURRENT.
> 
> Smells like I-cache incoherency to me...
> 
For the record, it is reproducible here on the G3.

One needs to 'shutdown -h' or power-off and then reboot with a -CURRENT 
kernel. Then the fatal appears.
Once booted into an old 7.1 kernel and rebooted w/o power-off, the boot 
succeeds with -CURRENT (r191402).

As said, fyi.
Andreas