linux-kernel - Re: Unreliable hibernation on Lenovo x230 (regression)

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Date:	Fri, 3 Apr 2015 09:23:35 +0800
From:	joeyli <jlee@...e.com>
To:	rhn <kebuac.rhn@...cupinefactory.org>
Cc:	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	joeyli.kernel@...il.com, linux-pm@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: Unreliable hibernation on Lenovo x230 (regression)

On Thu, Apr 02, 2015 at 08:12:00PM +0200, rhn wrote:
> On Fri, 3 Apr 2015 01:22:21 +0800
> joeyli <jlee@...e.com> wrote:
> 
> > On Fri, Apr 03, 2015 at 12:50:54AM +0800, joeyli wrote:
> > > Hi, 
> > > 
> > > On Thu, Apr 02, 2015 at 05:28:05PM +0200, Pavel Machek wrote:
> > > > On Wed 2015-04-01 21:47:43, rhn wrote:
> > > > > Hello,
> > > > > 
> > > > > Between kernel 3.16 and 3.17, a regression has been introduced where the first hibernation after regular shutdown always fails to resume. Subsequent hibernations succeed.
> > > > > 
> > > > > The system is a Lenovo x230 with Intel i5, booting with EFI, with the hibernate partition located on a secondary SSD drive. Installed system is Fedora 20, hibernation and reboots were issued using the KDE shutdown dialog.
> > > > > 
> > > > > I have tracked the problem to first appear in the commit
> > > > > e67ee10190e69332f929bdd6594a312363321a66	Merge branches 'pm-sleep', 'pm-cpufreq' and 'pm-cpuidle'
> > > > > 
> > > > > The problem itself manifests in dmesg as follows (system was first
> > > > > restarted, then hibernated - this log is from the subsequent
> > > > resume):
> > > > 
> > > > Ok, can you try to disable cpufreq and cpuidle, and then try if it
> > > > reproduces?
> > > > 
> > > > At that point, this is the candidate:
> > > > 
> > > > commit e67ee10190e69332f929bdd6594a312363321a66
> > > > Merge: 21c806d 84c91b7 39c8bba 372ba8c
> > > > Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > > Date:   Mon Aug 11 23:19:48 2014 +0200
> > > > 
> > > >     Merge branches 'pm-sleep', 'pm-cpufreq' and 'pm-cpuidle'
> > > > 
> > > >     * pm-sleep:
> > > >           PM / hibernate: avoid unsafe pages in e820 reserved regions
> > > > 
> > > > ...
> > > > Alternatively, you can just try to revert
> > > > 
> > > > commit 84c91b7ae07c62cf6dee7fde3277f4be21331f85
> > > > Author: Lee, Chun-Yi <joeyli.kernel@...il.com>
> > > > Date:   Mon Aug 4 23:23:21 2014 +0800
> > > > 
> > > >     PM / hibernate: avoid unsafe pages in e820 reserved regions
> > > > 
> > > >     When the machine doesn't well handle the e820 persistent when
> > > >     hibernate
> > > >         resuming, then it may cause page fault when writing image to
> > > >     snapshot
> > > >         buffer:
> > > > 
> > > > 
> > > > ...
> > > > 
> > > > Thanks,
> > > > 									Pavel
> > > 
> > > Before revert 84c91b7ae patch, please check does there have log similar as
> > > following in dmesg when hibernate resume fail?
> > > 
> > > [   24.349777] PM: 0xab9bc000 in e820 nosave region: [mem 0xab9bc000-0xab9c2fff]
> > > 
> > > The address may different, by you should see "e820 nosave region" log. Otherwise
> > > we got another problem.
> > >
> > 
> > Forgot to mention, please add "debug no_console_suspend=1 loglevel=9" to kernel
> > parameter then try to reproduce issue and look at dmesg.
> > 
> > 
> > Thanks a lot!
> > Joey Lee 
> 
> Yes, it's present in dmesg when hibernate fails (default kernel params):
> [    3.138824] PM: 0x9d3d3000 in e820 nosave region: [mem 0x9d3d3000-0x9d3d3fff]
>

OK, then the message means 0x9d3d3000 address used by image kernel but in e820
region of current boot. Need check does this e820 region used by setup_data so
reserved as E820_RESERVED_KERN.

Need your complete dmesg to verify the e820 table. If the above assumption is
true, then Yinghai Lu's patchset could fix this problem:

x86: Kill E820_RESERVED_KERN
https://lkml.org/lkml/2015/3/4/434

The target kernel version to merge his patches is v4.1
 
> I probably didn't make it clear - the top dmesg in my original message was from failed resume.
> 
> Cheers,
> rhn

On the other hand,
Could you please check you are using platform mode to turn off machine for
hibernating?

$ cat /sys/power/disk
[platform] shutdown reboot suspend

And, if possible, please file bug on bugzilla.kernel.org and give me the bug
number. I prefer collect log and debugging history in bugzilla for further
tracking.


Thanks a lot!
Joey Lee
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