linux-kernel - Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]

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Date:	Wed, 11 May 2016 17:25:37 +0200
From:	Jim Bos <jim876@...all.nl>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-arch@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	"Srivatsa S. Bhat" <srivatsa@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	rui.zhang@...el.com, len.brown@...el.com,
	Linux PM <linux-pm@...r.kernel.org>
Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]

On 05/11/2016 03:36 PM, Rafael J. Wysocki wrote:
> On 5/11/2016 2:21 PM, Ville Syrjälä wrote:
>> On Wed, May 11, 2016 at 02:11:29PM +0200, Sebastian Andrzej Siewior
>> wrote:
>>> On 05/11/2016 12:19 PM, Ville Syrjälä wrote:
>>>> Hi,
>>> Hi,
>>>
>>>> I have a Lenovo Ideapad S10-3t machine here (Atom N450, 1 core, 2 HT)
>>>> which fails to resume from S3 on 4.6-rc releases. I bisected it down to
>>>>
>>>> commit 1cf4f629d9d246519a1e76c021806f2a51ddba4d
>>>> Author: Thomas Gleixner <tglx@...utronix.de>
>>>> Date:   Fri Feb 26 18:43:39 2016 +0000
>>>>
>>>>      cpu/hotplug: Move online calls to hotplugged cpu
>>>>
>>>> Unfortunately that won't revert cleanly, and neither does the merge
>>>> commit, so I was unable to see if that is the only problematic commit
>>>> in 4.6.
>>>>
>>>> Any ideas?
>>> do you have a backtrace or anything or is it just not working and you
>>> end up with a blank screen?
>> Yeah can't get anything from the machine at that point. netconsole
>> didn't help either, and no serial on this machine. And IIRC I've
>> tried ramoops on this thing in the past but unfortunately the memory
>> got cleared on reboot.
>>
> 
> Please try
> 
> # echo processors > /sys/power/pm_test
> 
> and then suspend (it should simulate a suspend, wait for approx. 5 sec
> and then resume, see
> Documentation/power/basic_pm_debugging.txt for details).  See if that
> works or if you can get any
> traces etc.
> 
> Thanks,
> Rafael
> 


Hmm, I thought I had some resume issue but ignored that, so I just tried
again.
On 4.6.0-rc1 all is fine but on 4.6.0-rc7 on resume the machine locks up
totally. No response on ping or sysrq-B, only hard reset works.

Tried this 'echo processors > /sys/power/pm_test' follow by pm-suspend

and did find a lot of ACPI errors (attached) in the log which are
definitely not present after normal boot.

This is on a Intel(R) Pentium(R) CPU G3220 @ 3.00GHz

So not sure if this is same issue but just wanted to mention it.

_
Jim


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