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SubjectRe: [REGRESSION] NMI received for unknown reason 3c on CPU 0, strange powersaving mode?
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Am Montag, 2. April 2012 schrieb Srivatsa S. Bhat:
> On 03/30/2012 04:34 PM, Martin Steigerwald wrote:
> > Hi!
> >
> > Since some time I am seeing things like
> >
> > Message from syslogd@merkaba at Mar 30 00:29:30 ...
> >
> > kernel:[49074.294260] Uhhuh. NMI received for unknown reason 3c on
> > CPU 0.
> >
> > Message from syslogd@merkaba at Mar 30 00:29:30 ...
> >
> > kernel:[49074.294263] Do you have a strange power saving mode
> > enabled?
> >
> > Message from syslogd@merkaba at Mar 30 00:29:30 ...
> >
> > kernel:[49074.294264] Dazed and confused, but trying to continue
> >
> > on resume after in-kernel hibernation.
>
> Do you see this after suspend-to-ram too?

No.

> > I do not see any trace of it in syslog, kern.log or dmesg.
> >
> > From the timestemp it seems that these messages are issued shortly
> > before I send the laptop to hibernation last night.
> >
> >
> > I am using a ThinkPad T520 with Intel(R) Core(TM) i5-2520M CPU @
> > 2.50GHz and Sandybridge graphics.
> >
> > I am not exactly sure since when it happens, cause I basically
> > ignored it for quite some time. Might be some 3.2 kernel where it
> > started, maybe even the first 3.2 kernel I had. Currently I am
> > using:
> >
> > martin@merkaba:~> cat /proc/version
> > Linux version 3.3.0-trunk-amd64 (Debian 3.3-1~experimental.1)
> > (debian- kernel@lists.debian.org) (gcc version 4.6.3 (Debian
> > 4.6.3-1) ) #1 SMP Thu Mar 22 18:02:10 UTC 2012
> >
> > Since I am quite sure I didn´t see this with the first kernel I used
> > on this machine, which was a 2.6.39 if I remember correctly, I
> > consider this to be a regression for now.
> >
> >
> > I did not see any other strange effects, only this message.
> >
> >
> > When searching for it I see quite some references¹. But what I looked
> > at seemed to either quite old or different in that the machine was
> > frozen then.
>
> There was once such a bug report and commit 144060fee (perf: Add PM
> notifiers to fix CPU hotplug races) tried to fix it, however it didn't
> work out IIRC.
>
> Can you please try out the pm-test framework and let us know in which
> phase this message is encountered?
> Documentation/power/basic-pm-debugging.txt
>
> 1. Recompile the kernel with CONFIG_PM_DEBUG=y

Luckily I have this already.

martin@merkaba:~> grep CONFIG_PM_DEBUG /boot/config-3.3.0-trunk-amd64
CONFIG_PM_DEBUG=y

> 2. # cat /sys/power/pm_test
> 3. # echo <value> > /sys/power/pm_test
> Use the values from the list given in step 2.
> From freezer to core, it is increasing depth of suspend phase.
> 4. # echo mem > /sys/power/state (for suspend-to-ram)
> or echo disk > /sys/power/state (for suspend-to-disk)

I understand it that you want me to do step 4 for each of the values from
step 3. If not so, please tell me.

Now I send this out, before I start my tests. ;)

Ciao,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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