linux-kernel - Re: [BUG] While changing the cpufreq governor, kernel hits a bug in workqueue.c

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Date:	Fri, 27 Jun 2008 09:42:09 +0530
From:	Nageswara R Sastry <rnsastry@...ux.vnet.ibm.com>
To:	Johannes Weiner <hannes@...urebad.de>
CC:	linux-kernel@...r.kernel.org, balbir@...ux.vnet.ibm.com,
	ego@...ux.vnet.ibm.com, svaidy@...ux.vnet.ibm.com,
	davej@...emonkey.org.uk
Subject: Re: [BUG] While changing the cpufreq governor, kernel hits a bug
 in workqueue.c

Nageswara R Sastry wrote:
Hi,
>> =======================================================
>> [ INFO: possible circular locking dependency detected ]
>> 2.6.25.7.cpufreq_patch #2
>> -------------------------------------------------------
[...]

> While running the script I observed no stack trace but sysfs hang for a 
> particular file like scaling_governor under cpufreq for a particular cpu 
> (this cpu is varying). In the following run I experienced with cpu4.
> 
> cat /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
> 
> The above command is not giving any result and it won't be coming out 
> after pressing ctrl+c or ctrl+z


Applied both the patches and it seems working fine - no stack trace, but 
the above "mentioned circular locking dependency and sysfs file hang" 
are existing.

Thanks
Regards
R.Nageswara Sastry
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