linux-kernel - Re: Uhhuh - Dazed and confused, but trying to continue :)

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Date:	Wed, 21 Jan 2015 10:01:32 +0100
From:	poma <pomidorabelisima@...il.com>
To:	Don Zickus <dzickus@...hat.com>
CC:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Mailing-List fedora-kernel <kernel@...ts.fedoraproject.org>,
	Jeremy Newton <alexjnewt@...mail.com>,
	Thomas Koch <linrunner@....net>,
	André Erdmann <dywi@...lerd.de>,
	Pali Rohár <pali.rohar@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: Uhhuh - Dazed and confused, but trying to continue  :)

On 19.01.2015 14:49, Don Zickus wrote:
> On Sun, Jan 18, 2015 at 11:50:38AM +0100, poma wrote:
>>
>> Salutem
>>
>> This happened only on thaw from S4 aka hibernate.
>> What should be "strange power saving mode" these messages relate!?
>>
>> [  208.252986] Uhhuh. NMI received for unknown reason 3d on CPU 0.
>> [  208.252991] Do you have a strange power saving mode enabled?
>> [  208.252992] Dazed and confused, but trying to continue
>>
>> 3.18.3-200.fc21.x86_64
> 
> This looks to be an external unknown NMI (unless you can reproduce on
> something other than cpu0).
> 
> I would have to know what hardware you have and see the dmesg log after
> the resume from hibernate.
> 
> You can open a bz and assign it to me.
> 
> Just attach the dmesg log, lspci and lspci -t output to the bz.
> 
> Though this is most likely a pci device firmware problem.  But I can try
> to narrow it down.
> 
> Cheers,
> Don
> 

Thank you, in the meantime, I've found what causes non-maskable interrupt, [23]d on CPU 0, on resuming S4,
on AMD Phenom(tm) II X4 955 Processor.

/etc/default/tlp
...
# Kernel NMI Watchdog
# 0=disable (default, saves power) / 1=enable (for kernel debugging only)
NMI_WATCHDOG=0

Toggling to 1, messages no longer appear,
NMI_WATCHDOG=1

$ cat /proc/sys/kernel/nmi_watchdog
1
$ sysctl kernel.watchdog
kernel.watchdog = 1

Isn't it brilliant.


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