linux-kernel - Re: [Bug #13809] oprofile: possible circular locking dependency detected

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Date:	Wed, 05 Aug 2009 16:45:43 +0200
From:	Jerome Marchand <jmarchan@...hat.com>
To:	Robert Richter <robert.richter@....com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #13809] oprofile: possible circular locking dependency	detected

Robert Richter wrote:
> I also tested v2.6.31-rc4 with prove-locking enabled and could not
> trigger the warning. My regression runs fine. Please provide more
> information (workloads, oprofile setup, cpu info, kernel config) to be
> able to reproduce this.
> 
> Thanks,
> 
> -Robert
> 

Hi Robert,

I hit the warning on a dual i686 box, with both v2.6.31-rc2 and v2.6.31-rc4.
I can actually trigger it by just running opcontrol --start and then opreport.
It happens with both --separate=none and --separate=all options (the oprofile
deamon using otherwise default options).
About the kernel config, prove_locking is on, oprofile is a module and
oprofile_ibs is not set. For maor detail, I've attached the config file to
the bugzilla.

I've tried to reproduce it on 2.6.31-rc5 without success.

Regards,
Jerome

> On 26.07.09 22:28:24, Rafael J. Wysocki wrote:
>> This message has been generated automatically as a part of a report
>> of recent regressions.
>>
>> The following bug entry is on the current list of known regressions
>> from 2.6.30.  Please verify if it still should be listed and let me know
>> (either way).
>>
>>
>> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13809
>> Subject		: oprofile: possible circular locking dependency detected
>> Submitter	: Jerome Marchand <jmarchan@...hat.com>
>> Date		: 2009-07-22 13:35 (5 days old)
>>
>>
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