Syslog question

[Marius Gedminas]

On Wed, Oct 15, 2014 at 05:00:32PM +0100, R Kimber wrote:
> If I try to diagnose a problem by looking in /var/log/syslog I'm confronted
> mostly with messages of the form:-
> 
> <time> <host> [425828.266000] status interrupt: 80 02
> 
> My current syslog contains 792,386 of such messages.  They appear to be
> logged about 30 times a second.
> 
> Is this a bug?  It certainly makes solving problems more difficult having
> to sift through all this stuff.
> 
> If it's not a bug, how may I stop the messges from being logged?

Definitely a bug somewhere in the kernel (or your hardware).  This
volume of logging would be insane for normal use.

Looks like this message is printed by sound/usb/mixer.c:
https://github.com/torvalds/linux/blob/0429fbc0bdc297d64188483ba029a23773ae07b0/sound/usb/mixer.c#L2357

Do you have any USB sound devices plugged in?

Now about a workaround: these messages are printed using dev_dbg, which
is described in http://lwn.net/Articles/434833/

Ubuntu is built with CONFIG_DYNAMIC_DEBUG=y, so you can turn each of
these messages on and off separately.

In fact, they should be turned off at boot, according to that article.
Have you done something to turn them on?

What is your Ubuntu version?  Your kernel version?

What do you see if you run

  sudo grep 'status interrupt' /sys/kernel/debug/dynamic_debug/control

?

Marius Gedminas
-- 
Writing about music is like dancing about architecture.
		-- Frank Zappa
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