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From: "Daniel O'Connor" <doconnor@gsoft.com.au>
To: Alan Cox <alc@cs.rice.edu>
Date: Mon, 28 Sep 2009 11:33:55 +0930
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Cc: Attilio Rao <attilio@freebsd.org>, alc@freebsd.org,
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Subject: Re: 8.0-RC1 panic attaching ppc
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On Sun, 27 Sep 2009, Alan Cox wrote:
> Ok, now I can explain what is happening.  The kernel is using 1GB
> pages to implement the direct map.  Unfortunately, pmap_extract()
> doesn't know how to handle a 1GB page mapping.  pmap_kextract() only
> works by an "accident" of its different implementation.  In other
> words, it should not be relied upon to work either.
>
> Please revert whatever patch John gave you and try the attached
> patch. It simply disables the use of 1GB page mapping by the direct
> map.

Your patch fixes (works around?) the problem.

Thanks!

=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

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