Date:	Mon, 07 Apr 2014 13:45:06 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Manuel Krause <manuelkrause@...scape.net>
Cc:	Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, rui.zhang@...el.com,
	Jean Delvare <jdelvare@...e.de>, lm-sensors@...sensors.org
Subject: Re: 3.13.?: Strange / dangerous fan policy...

On Monday, April 07, 2014 01:17:51 AM Manuel Krause wrote:
> On 2014-04-06 04:43, Guenter Roeck wrote:
> > On 04/05/2014 07:37 PM, Manuel Krause wrote:
> >> On 2014-04-01 01:47, Guenter Roeck wrote:
> >>> On 03/31/2014 04:37 PM, Manuel Krause wrote:
> >>>> On 2014-03-20 21:21, Manuel Krause wrote:
> >>>>> On 2014-03-11 22:59, Manuel Krause wrote:
> >>>>>> On 2014-03-10 02:49, Manuel Krause wrote:
> >>>>>>> On 2014-03-09 18:58, Rafael J. Wysocki wrote:
> >>>>>>>> On Sunday, March 09, 2014 01:10:25 AM Manuel Krause wrote:
> >>>>>>>>> On 2014-03-08 16:59, Guenter Roeck wrote:
> >>>>>>>>>> On 03/08/2014 03:08 AM, Jean Delvare wrote:
> >>>>>>>>>>> On Fri, 7 Mar 2014 14:52:30 -0800, Guenter Roeck wrote:
> >>>>>>>>>>>> On Fri, Mar 07, 2014 at 11:04:29PM +0100, Manuel Krause
> >>>>>>>>>>>> wrote:
> >>>>> [SNIP]
> >>>>>
> >>>>> Long time no reply from you... Have I overseen a unwritten
> >>>>> convention? Or were my charts that unusable for your
> >>>>> analysis/work?
> >>>>>
> >>>>> Two days ago, I tried the 3.14.0-rc7-vanilla. And the problem
> >>>>> persists. "Strange / dangerous fan policy..."
> >>>>>
> >>>>> Since kernel 3.13.6 I've managed to 'fix' the potential
> >>>>> overheating problem by manually issuing a:
> >>>>> "echo 1 > /sys/class/thermal/cooling_device3/cur_state" *)
> >>>>> _before_ obviously critical temperatures occur. Remind: This
> >>>>> particular setting may only work for my system! ...and keeps
> >>>>> working for 3.14-rc.
> >>>>>
> >>>>> In the following I'd like to present you a modified output
> >>>>> of my
> >>>>> /sys/class/thermal, that I've written a script for (for my
> >>>>> system), that shows the results in the way of
> >>>>> linux/Documentation/thermal/sysfs-api.txt, point 3:
> >>>>> {I've uploded the files to pastebin, to not swamp you and the
> >>>>> lists with so many lines of logs.}
> >>>>>
> >>>>> For the last good kernel -- 3.12.14 -- in-use:
> >>>>>   http://pastebin.com/HL1PNcda
> >>>>> For my first bad kernel revision 3.13 -- at critical temp:
> >>>>>   http://pastebin.com/98hgf1a9
> >>>>> For the last bad kernel -- 3.14.0-rc7 -- at critical temp:
> >>>>>   http://pastebin.com/MuTwTnjD
> >>>>> For the last bad kernel -- 3.14.0-rc7 -- after issuing the
> >>>>>   *) command:
> >>>>>   http://pastebin.com/2peda54z
> >>>>>
> >>>>> Please, have a look at them! And maybe, give me hints on how I
> >>>>> can help you to further debug this issue, as my manual method
> >>>>> works but it's annoying.
> >>>>>
> >>>>> And, PLEASE CC: ME, as I'm not on the lists. Or lead this
> >>>>> Email-thread to someone in charge.
> >>>>>
> >>>>> Thank you for your work && best regards,
> >>>>> Manuel Krause
> >>>>>
> >>>>
> >>>> This is still BUG 71711
> >>>> https://bugzilla.kernel.org/show_bug.cgi?id=71711
> >>>>
> >>>> 3.12.15 works very well
> >>>> 3.13.7 fails
> >>>> 3.14.0-rc8 fails
> >>>>
> >>>
> >>> Best you can do would really be to bisect the problem.
> >>> Unfortunately only you (or someone else with an affected system)
> >>> can do that. Once the culprit is known it would be much easier
> >>> to get it fixed.
> >>>
> >>> To answer your earlier question: I don't think you did anything
> >>> wrong.
> >>> I guess everyone else is just as clueless as I am (if not,
> >>> speak up
> >>> and help ;-).
> >>>
> >>> Guenter
> >>>
> >>
> >> I've now bisected two times. From two different kernel origins,
> >> just to be sure, as I'm new to this stupid-and-lengthy method,
> >> and, to be sure, I haven't given a false positive inbetween due
> >> to boredom.
> >>
> >
> > Not really. Keep in mint that you were able to track down the bad
> > commit
> > among more than 10,000 commits in a reasonably short period of time.
> >
> >> In the end it says each time:
> >> # git bisect bad | tee -a /var/log/bisect.log
> >> cc8ef52707341e67a12067d6ead991d56ea017ca is the first bad commit
> >> commit cc8ef52707341e67a12067d6ead991d56ea017ca
> >> Author: Zhang Rui <rui.zhang@...el.com>
> >> Date:   Wed Sep 25 20:39:45 2013 +0800
> >>
> >>      ACPI / AC: convert ACPI ac driver to platform bus
> >>
> >>      Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> >>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >>
> > Off to the two of you...
> >
> > Guenter
> >
> >> :040000 040000 5a0d397cfcbf53c03390f2805b83754cb7837d84
> >> 4a2af1454f65d67f1d1a507c08e3b9ef3ffe57e7 M      drivers
> >>
> >>
> >> Please help me, on how I can help debug this more, and please
> >> also read the newest from
> >> https://bugzilla.kernel.org/show_bug.cgi?id=71711
> >>
> >> Manuel Krause
> >>
> >>
> >>
> >
> 
> Sorry, that I've forgotton to add the following last night: After 
> the first bisection round, I was so glad about a result that 
> time, that I reverted this mentioned patch from the 3.13.8 
> kernel, but this didn't fix it.

This means that the commit in question didn't introduce the problem
you're seeing.

Please check out commit 7f2dc5c4bcbf (Merge tag 'dm-3.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm),
build a kernel from that and see if you can reprocude the problem with it.
If so, it can be used as your new "first known bad" kernel for bisection.
Otherwise, you can use it as the "first good" one and commit cc8ef52707341
as "first known bad".

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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