linux-kernel - Re: 2.6.31-rc1-git9: INFO: possible circular locking dependency detected -- (&(&dbs_info->work)->work){+.+...}, at: [<c104292d>] __cancel_work

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Message-ID: <20090702162035.GB21746@redhat.com>
Date:	Thu, 2 Jul 2009 12:20:35 -0400
From:	Dave Jones <davej@...hat.com>
To:	Miles Lane <miles.lane@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Jun Nakajima <jun.nakajima@...el.com>, cpufreq@...r.kernel.org
Subject: Re: 2.6.31-rc1-git9: INFO: possible circular locking dependency
	detected -- (&(&dbs_info->work)->work){+.+...}, at: [<c104292d>]
	__cancel_work_timer+0x81/0x17f

On Thu, Jul 02, 2009 at 10:41:23AM -0400, Miles Lane wrote:
 > [  348.243995] [ INFO: possible circular locking dependency detected ]
 > [  348.244004] 2.6.31-rc1-git9 #13
 > [  348.244009] -------------------------------------------------------
 > [  348.244017] pm-suspend/3134 is trying to acquire lock:
 > [  348.244023]  (&(&dbs_info->work)->work){+.+...}, at: [<c104292d>]
 > __cancel_work_timer+0x81/0x17f
 > [  348.244025]
 > [  348.244025] but task is already holding lock:
 > [  348.244025]  (dbs_mutex){+.+.+.}, at: [<f805791c>]
 > cpufreq_governor_dbs+0x1fd/0x279 [cpufreq_ondemand]

well known by now. Venki is working on a fix, but it's not a simple
fix, so it's taking time.

	Dave
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