From mboxrd@z Thu Jan  1 00:00:00 1970
From: michi1@michaelblizek.twilightparadox.com (michi1 at michaelblizek.twilightparadox.com)
Date: Mon, 30 Sep 2013 16:59:32 +0200
Subject: Finding a rogue IO source
In-Reply-To: <5243255D.2050804@ubuntu.com>
References: <5243255D.2050804@ubuntu.com>
Message-ID: <20130930145931.GA4095@grml>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi!

On 14:03 Wed 25 Sep     , Phillip Susi wrote:
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> I have an unused disk ( no mounted filesystems ) that I put to sleep (
> hdparm -Y ) and every 10 minutes, the link is reset to process a
> request coming from a short lived process named "pool".  I think it is
> a kernel work queue.  I inserted a dump_stack() but it stops when it
> gets to the syscall and so doesn't trace back into what work item is
> running.  How can I figure out what work item is doing this?

Maybe you could try something like this:
printk(KERN_ERR "wakeup %d", current->pid);

	-Michi
-- 
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.twilightparadox.com