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From: Mike Harding <mvh@ix.netcom.com>
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Date: Mon, 25 Aug 2003 22:30:09 -0700 (PDT)
Subject: Re: PAE removal patch for testing
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I did just get a crash after doing the 'short' patch - I am reverting
to Aug. 7 code...

- Mike H.

> > Mike Tancsa wrote:
> > > At 04:51 PM 25/08/2003 -0500, Mike Silbersack wrote:
> > > 
> > > >Right now, anyone who is experiencing problems should definitely try that
> > > >short patch which Mike Tancsa said works for him and confirm whether or
> > > >not it fixes the issue on their system.
> > > 
> > > The 2 servers I am running it on both have been stable since applying it.
> > > ns4% uptime
> > >   9:58PM  up 2 days,  4:27, 2 users, load averages: 0.02, 0.03, 0.05
> > > ns4%
> > > 
> > > would have rebooted several times by now.  The other machine is also 
> > > stable.  Both are quite busy mail routers. One also runs spamassassin via a 
> > > milter.
> > 
> > This change matches -current and should probably be committed ASAP.
> 
>    I've reviewed it as well and it definitely is a bug that needs to be fixed
> ASAP. Basically, the pmap_remove code in -stable doesn't handle the case of
> crossing a page table boundry properly. If the next page table page isn't
> currently mapped, then the kernel will [fatally] fault when trying to access
> it.