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

Jerome Marchand
2009-08-05T14:45:43Z

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> Date : 2009-07-22 13:35 (5 days old)
>>
>>
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>