Can't load kernel errors (with wierd bios messages)

Scott Ullrich sullrich at
Wed Sep 7 11:17:17 PDT 2005

On 9/5/05, Scott Ullrich <sullrich at> wrote:
> On 9/5/05, Scott Ullrich <sullrich at> wrote:
> > Hello list!
> >
> > I'm trying to understand a problem that keeps coming up quite often
> > but I honestly have no idea what is going on.
> >
> > In random cases after upgrading I'm seeing the message:
> > Can't work out which disk we are booting from.
> > Guessed BIOS device 0xffffffff not found by probes, defaulting to disk0:
> >
> > can't load 'kernel'
> >
> > Screen shot of the error in action:
> >
> >
> > Does anyone know what causes this error?
> >
> > Thanks in advance!
> Sorry to reply to myself but wanted to pass on info that people are
> asking me in private e-mails:
> 1. We have tried ACPI w/o help
> 2. This happens on more than one machine (last could its about 9)
> 3. It always happens after the first bootup after upgrading the kernel and world

This problem is not going away and appears to be getting worse..   Now
we are seeing a similar problem after boot but the kernel panics!

The panic is "panic: free: guard1 fail @ 0x51984 from

Can anyone shed some light on what is going on and things that I can
do to prevent these problems?   We would like to release pfSense
( around the same time that FreeBSD 6 releases but I'm
affraid that with these problems lurking its not a good idea from a
support perspective.

Thanks again in advance!


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