linux-kernel - Re: 3.2.0-rc4+ (Linus GIT af968e29acd91ebeb4224e899202c46c93171ecd) -- Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze, wq

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Message-ID: <CAHFgRy_H4-aN7X65ivfgVS1iinw58kSR6Hbg2A6kGAxTOrWApg@mail.gmail.com>
Date:	Sat, 3 Dec 2011 12:17:53 -0500
From:	Miles Lane <miles.lane@...il.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: 3.2.0-rc4+ (Linus GIT af968e29acd91ebeb4224e899202c46c93171ecd)
 -- Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze, wq_busy=0):

On Sat, Dec 3, 2011 at 11:44 AM, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> On 12/03/2011 09:07 PM, Miles Lane wrote:
>
>> Thanks!  The patch worked perfectly.
>>
>>         Miles
>>
>
>
> I had written that patch when I found a possibility of freezing failure when
> looking at the code. I hadn't really hit the problem myself. (And to test my
> patch's effectiveness, I had used a synthetic scenario that I had created.)
>
> So, since you seem to have hit the problem during normal usage itself and not
> while doing anything fancy, out of curiosity, what triggered the problem?

I was intentionally checking for problems with reading the contents of
the /sys and /proc trees.  So I ran:
find /sys -name "[a-z]*" | xargs head
and
find /proc -name "[q-z]*" | xargs head
and then, while the commands were processing files I suspended
(unsuccessfully) the laptop.

I have often found bugs in this area, so I periodically run this test.
 Sometimes it turns up problems in accessing specific information in
the data files.  This is the first time I added trying to suspend
while the test was running.

Happy coding!
      Miles
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