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Subject: Re: jail: /etc/rc: cannot create /dev/null: Operation not supported
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Date: Thu, 16 Jul 2015 17:41:19 -0600
From: James Gritton <jamie@freebsd.org>
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On 2015-07-15 13:52, Per olof Ljungmark wrote:
> FreeBSD 10.2-PRERELEASE #0 r284949
> 
> The jail can be started, but when /etc/rc is executed:
> 
> root@mar:/ # sh -x /etc/rc
> + stty status ^T
> /etc/rc: cannot create /dev/null: Operation not supported
> + trap : 2
> + trap 'echo '\''Boot interrupted'\''; exit 1' 3
> + HOME=/
> + PATH=/sbin:/bin:/usr/sbin:/usr/bin
> + export HOME PATH
> + [ '' = autoboot ]
> + autoboot=no
> + _boot=quietstart
> + /sbin/sysctl -n vfs.nfs.diskless_valid
> /etc/rc: cannot create /dev/null: Operation not supported
> ...
> 
> I have done the procedure several times before but never saw this one
> before and don't know how to get around it.
> 
> Ideas anyone? Any recent changes that can show up like the above?
> 
> Thanks!

If it's trying to create /dev/null, I assume that the jail's /dev isn't
mounted when /etc/rc is running.  Do you have mount.devfs set in the
jail.conf, or jail_foo_devfs_enable in rc.conf (depending on your
configuration)? For that matter, can you tell if the jail's /dev is
mounted?

- Jamie