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From: Mark Atkinson <atkin901@yahoo.com>
Date: Tue, 06 Jan 2009 10:40:51 -0800
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Subject: Re: FreeBSD 8: fails booting from slice ad8s1a
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Replying to myself, solution below:

Mark Atkinson wrote:
> Trying to mount root from ufs:/dev/ad6s1a
> 
> Manual root filesystem specification:
>   <fstype>:<device>  Mount <device> using filesystem <fstype>
>                        eg. ufs:da0s1a
>   ?                  List valid disk boot devices
>   <empty line>       Abort manual input
> 
> mountroot> ?
> 
> List of GEOM managed disk devices:
>   ad6b ad6a ad6 acd0
> 
> Manual root filesystem specification:
>   <fstype>:<device>  Mount <device> using filesystem <fstype>
>                        eg. ufs:da0s1a
>   ?                  List valid disk boot devices
>   <empty line>       Abort manual input
> 
> mountroot> ufs:ad6a
> Trying to mount root from ufs:ad6a
> WARNING: / was not properly dismounted
> /: mount pending error: blocks 8 files 1
> Lookup of /dev for devfs, error: 20
> exec /sbin/init: error 20
> exec /sbin/oinit: error 20
> exec /sbin/init.bak: error 20
> exec /rescue/init: error 20
> exec /stand/sysinstall: error 20
> init: not found in
> path /sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall
> panic: no init
> cpuid = 1
> KDB: enter: panic
> [thread pid 1 tid 100002 ]
> Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
> db>

This is the 'stale label' problem described here:

http://lists.freebsd.org/pipermail/freebsd-current/2008-December/001750.html

with the solution here:

http://lists.freebsd.org/pipermail/freebsd-current/2009-January/001892.html

After erasing the 'non-slice' label on the disk, I'm able to mount root.

-- 
Mark Atkinson
atkin901@yahoo.com
(!wired)?(coffee++):(wired);