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

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Message-ID: <f4e013870704241701y748cd32esfd8dd79658797320@mail.gmail.com>
Date:	Tue, 24 Apr 2007 17:01:24 -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

On 4/24/07, John Anthony Kazos Jr. <jakj@...-k-j.com> wrote:
> >
> > I am getting this odd content in the trace log (dmesg), and I cannot
> > figure out what it is or why it is there.
> >
> > <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7>
> > <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7>
> > <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7>
> > <7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7><7>
> > <7><7><7><7><7>__bio_add_page: 2x ph 88>=128 || hw 88>=88 || 360448>max
> > ffffffff802525d8 generic_make_request(bio 000001017c745300) 50729472, 704
>
> "<7>" is KERN_DEBUG in <include/linux/kernel.h>, used with printk. Are you
> using printk in the following forms?
>
> printk(KERN_DEBUG "A debug message.\n");
>
Yes, exclusively.

> 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?

> Remember, if you have a string in a variable without a KERN_*
> prependation, you can do this.
>
> printk(KERN_DEBUG "%s\n", debug_message);
>
Haven't tried that one - they're all of the form above.

Thanks again.

-- 
Mark Hull-Richter, Linux Kernel Engineer
DATAllegro (www.datallegro.com)
85 Enterprise, Second Floor, Aliso Viejo, CA  92656
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