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Date:      Tue, 8 Jun 2010 15:14:13 -0700 (PDT)
From:      Hubert Tournier <hubert@frbsd.org>
To:        freebsd-emulation@freebsd.org
Subject:   Panic with FreeBSD Guest in FreeBSD VirtualBox host
Message-ID:  <28823754.post@talk.nabble.com>

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Hello,

I noticed that FreeBSD guests (either i386 or amd64, release 7.x or 8.x,
even freshly installed from the install CD) running in VirtualBox (3.1.4 to
3.2.2) on FreeBSD hosts (only tested on 8.0pX amd64, but on 4 machines with
different hardware) panic during the boot sequence, just after the "Starting
cron" message, and enter an endless loop of reboots:

http://old.nabble.com/file/p28823754/panic1.png 

The same VMs work fine on VirtualBox (any version) on a Windows XP guest,
and used to work on VirtualBox 3.1.2 on a FreeBSD host.

I can boot a blank VM with the FreeBSD install CD and proceed with
installation, but the problem occurs during the first reboot of the
installed system.

I've no troubles with VM guests using Linuxes (CentOS, Ubuntu, Red Hat) or
Windows (XP, 2008).

With some additional debug messages, i've seen that the problem happens in
/etc/rc.d/mixer:

http://old.nabble.com/file/p28823754/panic2.png 

So, i put a mixer_enable="NO" in /etc/rc.conf and was able to complete the
boot sequence.

Unfortunately, a few commands later, even doing a simple "ls", the VM panics
again.

I tried with a generic kernel instead of a custom one, and an unmodified
VirtualBox port, but got the same results.

Any idea? Are there other people encountering this?

Best regards,

Hubert

PS: if needed, i can provide root access to an Internet server where the
problem happens, to the vbox team.
PPS: i haven't filed a PR for this, but can do if wanted.
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