linux-kernel - Re: Kernel traces coming back with trash/clutter [SOLVED]

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Date:	Wed, 25 Apr 2007 12:14:15 -0700
From:	"Mark Hull-Richter" <mhullrich@...il.com>
To:	"John Anthony Kazos Jr." <jakj@...-k-j.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kernel traces coming back with trash/clutter [SOLVED]

On 4/24/07, John Anthony Kazos Jr. <jakj@...-k-j.com> wrote:
> > > Perhaps you have something looping that's outputting KERN_DEBUG with a
> > > null message? Or one of your diagnostic printk statements includes
> > > KERN_DEBUG with no actual message?
> > >
> > No, they are all KERN_DEBUG<space>"some string here", almost all with
> > some formatted output as well.  Could I be overloading the printk
> > output buffer, as in possibly too tightly repeated/looped code to be
> > able to output it all?
>
> It is possible, I suppose. Is what you're working on open-source? If so,
> you could send it to me and I could try and reproduce it here and track it
> down. If you want me to, that is. (If you do send, please include a
> ".config".)
>
> Otherwise, I couldn't tell you what it might be. Make sure all your
> messages end with '\n', make sure you're not accidentally using the wrong
> formatting codes and it's backing over previous output with ^H or
> something. You could confirm or rule out the possibility of overflowing
> the printk buffers by writing a dummy module with a tight loop of nothing
> but printk statements with counters to see if you can get it to asplode.
>

It seems that my 'all KERN_DEBUG<space>"some string here"' was off by
one - there was one, the newest, with a comma after the KERN_DEBUG.
Removing it solved the problem.

Many thanks for the assistance.

-- 
Mark Hull-Richter, Linux Kernel Engineer
DATAllegro (www.datallegro.com)
85 Enterprise, Second Floor, Aliso Viejo, CA  92656
949-680-3082 - Office     949-330-7691 - fax
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