Re: 3.2.0-rc4+ (Linus GIT af968e29acd91ebeb4224e899202c46c93171ecd) -- Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze, wq_busy=0):

["Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>]

On 12/03/2011 10:47 PM, Miles Lane wrote:

> On Sat, Dec 3, 2011 at 11:44 AM, Srivatsa S. Bhat
> <srivatsa.bhat@linux.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
> 


Great! Thanks for telling how you triggered the problem!

Regards,
Srivatsa S. Bhat