BeagleBone locked up

[Ian Lepore]

On Mon, 2013-02-11 at 20:48 -0500, Brett Wynkoop wrote:
> On Mon, 11 Feb 2013 17:45:32 -0700
> Ian Lepore <ian at freebsd.org> wrote:
> 
> > On Mon, 2013-02-11 at 19:06 -0500, Brett Wynkoop wrote:
> > > Greeting-
> > > 
> > > While building a kernel the Bone stopped responding on the net and
> > > this is what I found on the console:
> > > 
> > > ti_mmchs0: Error: current cmd NULL, already done?
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 5534, size:
> > > 8192
> > [...]
> > > ti_mmchs0: Error: current cmd NULL, already done?
> > > ifaddr cache = 0xc1fbd700  is deleted
> > > ti_mmchs0: Error: current cmd NULL, already done?
> > > ti_mmchs0: Error: current cmd NULL, already done?
> 
> snip
> 
> > 
> > That's the second report recently of indefinite wait buffer.  What it
> > really means is that it has been waiting more than 20 seconds to pull
> > a page (or block of pages) in from swap.  That plus the cmd NULL
> > errors tend to point in the direction of the mmchs driver.
> > 
> > -- Ian
> 
> Greeting-
> 
> I am glad that I am passing on needed feedback.  I did not have to
> reboot the box, just waited and the console eventually responded again
> and I restarted sshd.

When it gets into that sort of state, can you get a response by hitting
^T on the console (or any open ssh terminal session)?  If so, the line
it prints may have a clue about what it's blocked on.

-- Ian