linux-kernel - Re: NMI error and Intel S5000PSL Motherboards

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Date:	Fri, 28 Sep 2007 11:11:37 -0400
From:	AndrewL733 <AndrewL733@....com>
To:	rdunlap@...otime.net
CC:	Jim Paris <jim@...n.com>, linas@...tin.ibm.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	samson yeung <fragmede@...patchdown.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	bbermack@...m.mit.edu, Justin Mazzola Paluska <jmp@....edu>
Subject: Re: NMI error and Intel S5000PSL Motherboards

rdunlap@...otime.net wrote:
> On Wed, 26 Sep 2007 19:48:14 -0400 Jim Paris wrote:
>
>   
>> Hello,
>>
>>     
>>> We have about 100 servers based on Intel S5000PSL-SATA motherboards. 
>>> They have been running for anywhere between 1 and 10 months. For the 
>>> past few months, after updating them all to the 2.6.20.15 kernel 
>>> (because of a bug in the 2.6.18 kernel), we are seeing some strange NMI 
>>> errors. For example:
>>>
>>> Aug 29 09:02:10 master kernel: Uhhuh. NMI received for unknown reason 30.
>>> Aug 29 09:02:10 master kernel: Do you have a strange power saving mode enabled?
>>> Aug 29 09:02:10 master kernel: Dazed and confused, but trying to continue
>>>       
>> I'm also working with Andrew and Samson.  It seems that the cause of
>> the problem is CONFIG_PCIEAER, which was introduced after 2.6.18 and
>> defaults to y.
>>
>> With CONFIG_PCIEAER=n, scanpci works fine with no errors.  This is the
>> workaround that they'll likely use for now.
>>     
>
> Glad that you found it.
>   
>   
>> With CONFIG_PCIEAER=y, scanpci always triggers the NMI error.  The
>> option aerdriver.forceload=1 has no effect.
>>     

So, looking for some closure here, what do we think is the "root cause"? 
Is it:

1)  a defect with Intel's S5000PSL motherboards that is exposed by an 
otherwise fine new (since 2.6.19) Linux kernel feature? (in which case 
we and others should probably press Intel to recognize they have a 
problem, seeing as they only "officially support" distributions running 
on 2.6.16 or below so maybe they don't even know about this issue).

2)  a problem with PCIEAER? And maybe "CONFIG_PCIEAER=y"  should NOT be 
the default setting? (in which case the kernel maybe needs fixing)

3)  just a bad interaction between a good motherboard and a good Linux 
feature that don't play well together? (in which case this is a kernel 
"feature" that anybody compiling a kernel to run on the Intel S5000PSL 
motherboard should know not to enable -- maybe a note is warranted so 
that when configuring the kernel, people with S5000PSL motherboards 
might not make the same mistake???).

>
> The 'forceload' option only forces the driver to load even when the
> ACPI hardware initialization routine fails.
>
> It would be nice to be able to disable PCIEAER at boot time though.
> Shouldn't be difficult.
>
>
>   
>> The related dmesg output at boot is:
>>
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   aer_init: AER service init fails - Run ACPI _OSC fails
>>   aer: probe of 0000:00:02.0:pcie01 failed with error 2
>>   aer_init: AER service init fails - No ACPI _OSC support
>>   aer: probe of 0000:00:03.0:pcie01 failed with error 1
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   aer_init: AER service init fails - Run ACPI _OSC fails
>>   aer: probe of 0000:00:04.0:pcie01 failed with error 2
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   aer_init: AER service init fails - Run ACPI _OSC fails
>>   aer: probe of 0000:00:05.0:pcie01 failed with error 2
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   Evaluate _OSC Set fails. Status = 0x0005
>>   aer_init: AER service init fails - Run ACPI _OSC fails
>>   aer: probe of 0000:00:06.0:pcie01 failed with error 2
>>   aer_init: AER service init fails - No ACPI _OSC support
>>   aer: probe of 0000:00:07.0:pcie01 failed with error 1
>>
>> Full dmesg, lspci, and ACPI DSDT are available here:
>>   http://jim.sh/~jim/tmp/nmi/
>>
>> -jim
>>     
>
>
> ---
> ~Randy
> Phaedrus says that Quality is about caring.
>   

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