RELENG_8 regression: cannot detect partitions (now with boot -v)

[Ted Faber]

On Tue, Sep 22, 2009 at 11:47:00AM -0700, Ted Faber wrote:
> On Tue, Sep 22, 2009 at 07:45:15PM +0200, Dimitry Andric wrote:
> > On 2009-09-22 17:14, Ted Faber wrote:
> > > That's the USB disk label I was using to get the boot from.  The slices
> > > on ad0: /dev/ad0s1a /dev/ad0s1d and /dev/ad0s1e are the ones I don't
> > > see.
> > 
> > Just checking. :)  Can you run (from a rescue disk or 7-STABLE):
> > 
> >   dd if=/dev/ad2 count=4 2>/dev/null | hexdump -C
> > 
> > and post the output here?  Output of fdisk and bsdlabel would also be
> > handy.
> 
> The bsdlabel and fdisk were attached to the first message, but I've
> attached them here as well, along with the output of 
> 
> $ dd if=/dev/ad0 count=4 2>/dev/null | hexdump -C
> 
> from the running 7.2 install.  7.2 finds the disk as ad0 not ad2.
> 
> I've also gotten a pointer to this message, which sounds a lot like my
> problem:
> 
> http://docs.freebsd.org/cgi/getmsg.cgi?fetch=774931+0+archive/2009/freebsd-current/20090118.freebsd-current
> 
> I'm planning to save that sector and then try erasing it as the message
> suggests when I get access to the machine tonight.  If the output from
> the dd above will confirm that diagnosis, that would be great.  I don't
> know what a stale disklabel looks like, myself...

Just for the record, clearing the disk label as described above solved
the problem finding partition tables.

-- 
Ted Faber
http://www.isi.edu/~faber           PGP: http://www.isi.edu/~faber/pubkeys.asc
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