Re: NMI received for unknown reason, 2.6.38-rc6 regression?

[Ingo Molnar]

* denys@xxxxxxxxxxx <denys@xxxxxxxxxxx> wrote:

> On Tue, 01 Mar 2011 19:08:43 +0300, Cyrill Gorcunov wrote:
> >On 03/01/2011 06:03 PM, denys@xxxxxxxxxxx wrote:
> >>I upgrade around 140 hosts (from 2.6.33 till 2.6.37), and got on
> >>many of them error/warining, flooding kernel log. Here is short
> >>snapshot:
> >>
> >>[ 1882.057474] Uhhuh. NMI received for unknown reason 3c on CPU 0.
> >>[ 1882.057576] Do you have a strange power saving mode enabled?
> >>[ 1882.057672] Dazed and confused, but trying to continue
> >>[ 2421.419732] Uhhuh. NMI received for unknown reason 3c on CPU 0.
> >>[ 2421.419835] Do you have a strange power saving mode enabled?
> >>[ 2421.419930] Dazed and confused, but trying to continue
> >>[ 2636.016831] Uhhuh. NMI received for unknown reason 2c on CPU 1.
> >>[ 2636.016934] Do you have a strange power saving mode enabled?
> >>[ 2636.017003] Dazed and confused, but trying to continue
> >>
> >>Full dmesg from 2 machines:
> >>http://www.nuclearcat.com/dmesg1.txt
> >>http://www.nuclearcat.com/dmesg2.txt
> >>I can provide more, if required.
> >>
> >>It seems nmi_watchdog is enabled by default, and it is causing
> >>issue. I am checking now with nmi_watchdog=0, but i need more
> >>time to confirm that.
> >>Also i am experiencing some problem with ppp users(all of them
> >>is pppoe servers), but i am not sure it is related to that, so
> >>maybe this NMI warning is just cosmetic regression.
> >>
> >>All systems is x86, same kernel config.
> >>If you need more information - let me know.
> >>
> >
> >nmi_watchdog=0 should help here, actually a nit was fixed by
> >https://patchwork.kernel.org/patch/566611/
> >which is not in 2.6.38-rc6 but I rather suspect it'll be in -rc7 or
> >final .38. If you have an ability
> >to pickup it and test -- this would be great!
> I test it, and it seems helps. At least on one host, and yes, seems
> all of them P4.

Mind checking -rc7, does it work 'out of box', without requiring any workarounds? 
-rc7 already has this fix included:

 7d44ec193d95: perf, x86: P4 PMU: Fix spurious NMI messages

-rc6 did not have it yet.

Thanks,

	Ingo
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