Hello,

quoted text
> 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.

With CONFIG_PCIEAER=y, scanpci always triggers the NMI error.  The
option aerdriver.forceload=1 has no effect.

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
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