linux-kernel - Re: 2.6.34-rc5-git3 - INFO: possible circular locking dependency detected - (s_active#91){++++.+}, at: [<ffffffff81142c4a>] sysfs_addrm

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Date:	Fri, 23 Apr 2010 22:11:08 -0400
From:	Dave Jones <davej@...hat.com>
To:	Miles Lane <miles.lane@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.34-rc5-git3 - INFO: possible circular locking dependency
 detected - (s_active#91){++++.+}, at: [<ffffffff81142c4a>]
 sysfs_addrm_finish+0x31/0x50

On Fri, Apr 23, 2010 at 09:56:20PM -0400, Miles Lane wrote:
 > [ 2564.720395] Disabling non-boot CPUs ...
 > [ 2564.764388]
 > [ 2564.764391] =======================================================
 > [ 2564.764395] [ INFO: possible circular locking dependency detected ]
 > [ 2564.764400] 2.6.34-rc5-git3 #22
 > [ 2564.764403] -------------------------------------------------------
 > [ 2564.764408] pm-suspend/5388 is trying to acquire lock:
 > [ 2564.764412]  (s_active#91){++++.+}, at: [<ffffffff81142c4a>]
 > sysfs_addrm_finish+0x31/0x50
 > [ 2564.764432]
 > [ 2564.764434] but task is already holding lock:
 > [ 2564.764437]  (&per_cpu(cpu_policy_rwsem, cpu)){+++++.}, at:
 > [<ffffffff8132dd4d>] lock_policy_rwsem_write+0x4a/0x7b
 > [ 2564.764450]
 > [ 2564.764451] which lock already depends on the new lock.
 > [ 2564.764454]


gah, this has been fixed in cpufreq.git for a while. I thought I'd
already pushed that along to Linus. I just sent him another pull request.

thanks,

	Dave

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