Message-ID: <4AD422F2.4080308@sbg.ac.at>
Date: Tue, 13 Oct 2009 08:49:22 +0200
From: Alexander Huemer <alexander.huemer@sbg.ac.at>
User-Agent: Thunderbird 2.0.0.23 (X11/20090826)
MIME-Version: 1.0
To: Tejun Heo <tj@kernel.org>
CC: Jean Delvare <jdelvare@suse.de>, Frans Pop <elendil@planet.nl>,
       linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
       Jeff Garzik <jgarzik@pobox.com>, alexander.huemer@sbg.ac.at
Subject: Re: 2.6.{30,31} x86_64 ahci problem - irq 23: nobody cared
References: <4ABBB8C2.2080901@sbg.ac.at> <200910101513.51320.elendil@planet.nl> <4AD2DFA4.9000602@kernel.org> <200910121148.16439.elendil@planet.nl> <4AD2FC60.8080705@kernel.org> <4AD2FD10.2010800@sbg.ac.at> <4AD2FFC7.5010402@kernel.org> <4AD300B5.6080102@sbg.ac.at> <4AD34554.3050701@sbg.ac.at> <4AD3E348.5030508@kernel.org>
In-Reply-To: <4AD3E348.5030508@kernel.org>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2974
Lines: 101

Tejun Heo wrote:
> [cc'ing Jean and quoting whole body]
>
> Hello, Jean.
>
> It seems i2c_i801 is triggering IRQ storm on Alexander's machine.  The
> original thread is
>
>  http://thread.gmane.org/gmane.linux.kernel/894187
>
> Any ideas?
>
> Thanks.
>
> Alexander Huemer wrote:
>   
>> Alexander Huemer wrote:
>>     
>>> Tejun Heo wrote:
>>>       
>>>> Alexander Huemer wrote:
>>>>  
>>>>         
>>>>> Tejun Heo wrote:
>>>>>   
>>>>>           
>>>>>> Frans Pop wrote:
>>>>>>  
>>>>>>     
>>>>>>             
>>>>>>> On Monday 12 October 2009, Tejun Heo wrote:
>>>>>>>          
>>>>>>>               
>>>>>>>> Alexander, can you please attach full boot log and the output of
>>>>>>>> "lspci -nn"?  Also, how reproducible is the problem?  You already
>>>>>>>> answered to Frans' question but can you be more specific?
>>>>>>>>                 
>>>>>>>>                 
>>>>>>> Full dmesg was made available earlier at:
>>>>>>> http://xx.vu/~ahuemer/dmesg_ahuemer_20090923
>>>>>>>             
>>>>>>>               
>>>>>> Does blacklisting i801_smbus make any difference?
>>>>>>
>>>>>>         
>>>>>>             
>>>>> lspci -nn:
>>>>> http://xx.vu/~ahuemer/lspci_nn_ahuemer_20091012
>>>>>
>>>>> what do you mean with "blacklisting i801_smbus" ?
>>>>>     
>>>>>           
>>>> [    3.872387] i2c /dev entries driver
>>>> [    3.873943] i801_smbus 0000:00:1f.3: PCI INT B -> GSI 23 (level,
>>>> low) -> IRQ 23
>>>> [    3.875580] w83627hf: Found W83627HF chip at 0x290
>>>>
>>>> IRQ23 is also used by i801_smbus and it would be nice to confirm
>>>> whether the problem can still be triggered with that driver not
>>>> loaded.  Adding "blacklist i2c_i801" to /etc/modprobe.d/blacklist
>>>> should probabaly do the trick.
>>>>
>>>> Thanks.
>>>>
>>>>   
>>>>         
>>> okay, i think you assume that i2c_i801 is a module.
>>> it is indeed built into the kernel.
>>> i'll rebuild the kernel without that component and run a test again.
>>>
>>> regards
>>> -alex
>>>       
>> tejun, it seems you hit an interesting point.
>> i compiled kernel-2.6.31.3 with my ususal config _without_ i2c_i801.
>> my usual test (compilation of gcc-4.3.2) finished 5 times without the
>> error.
>> i'll let it run some more times over night.
>> does anybody have an idea how i can trace what exactly causes the error
>> during the compilation run so that i can create a short test program ?
>>
>> regards
>> -alex
>>     
>
>   
hi,

i compiled gcc in a loop over night, 14 times. no error.
it really seams i2c_i801 was the cause...
unfortunately i still don't know how i can extract the part of the gcc
compilation process that causes the error on an affected kernel.
that would enable me to create a simple test program.

regards
-alex
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/