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Date:      Mon, 18 Apr 2011 08:24:57 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        freebsd-hackers@freebsd.org
Cc:        rank1seeker@gmail.com, Pawel Jakub Dawidek <pjd@freebsd.org>
Subject:   Re: Add SUM sysctl
Message-ID:  <201104180824.57541.jhb@freebsd.org>
In-Reply-To: <20110416.142444.546.5@DEV>
References:  <20110415.150349.671.1@DEV> <D18D23C3-5179-46BE-BAA6-288B06DB0408@gsoft.com.au> <20110416.142444.546.5@DEV>

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On Saturday, April 16, 2011 10:24:44 am rank1seeker@gmail.com wrote:
> After compilation of kernel and world in MUM, kernel is installed in MUM, 
> but to install world, we reboot into SUM, then install world. (HANDBOOK)
> Now, in case of GELI usage AND if upgrading is taking place, i.e; 8.2 -> 
> 8.3, once you reboot into SUM to install world, you are doomed, BECAUSE 
> ...
> Kernel will bitch (GELI part), about world->kernel mismatch and you won't 
> be able to install world as you cant decrypt geom providers!!
> The only way to save yourself in that case is to restore /boot/kernel.old, 
> or one is doomed.

This seems broken to me.  An 8.3 kernel+modules should be able to handle GELI 
devices with an 8.2 world.  If they can't, it means someone broke the ABI.  
Even a 9.0 kernel should work fine with an 8.x-stable world.

-- 
John Baldwin



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