The following reply was made to PR kern/166174; it has been noted by GNATS.
From: "Bill Cole" <fbsdbugs-20120...@billmail.scconsult.com>
To: bug-follo...@freebsd.org, ilsuj...@gmail.com
Subject: Re: kern/166174: [xen] Problems ROOT MOUNT ERROR <freebsd 8.3>
Date: Mon, 04 Jun 2012 16:29:08 -0400
This problem remains in 8.3-RELEASE and in the current RELENG_8_3. A
kernel built for amd64 with the XENHVM config on 8.2p4 boots properly
under XenServer 5.6 or 6.0, but the same config with 8.3 fails to detect
and attach the xbd0 device for the root filesystem. The 8.3 GENERIC
kernel boots normally as well, but without the Xen PV drivers.
I have tried to get a XENHVM kernel working both by updating a 8.2p4
XENHVM system to RELENG_8_3 with its existing config and by installing a
fresh 8.3-RELEASE/GENERIC system on a new VM and building XENHVM kernels
on it: in all cases the failure is identical. I was able to update the
8.3-RELEASE/GENERIC system to a RELENG_8_3/GENERIC kernel and world from
source without any trouble. I am reasonably experienced with
custom-built kernel installs & I'm pretty sure that I've gone back over
every "stupid sysadmin" failure mode and eliminated it. Device driver
code is a realm for younger brains, but I am suspicious that the root
cause is somewhere in the extensive changes made to
src/sys/dev/xen/blkfront/blkfront.c and connected code ahead of the 8.3
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