Re: Unreliable hibernation on Lenovo x230 (regression)

[rhn]

On Fri, 03 Apr 2015 23:43:30 +0200
"Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> wrote:

> On Friday, April 03, 2015 05:58:25 PM rhn wrote:
> > On Thu, 2 Apr 2015 17:28:05 +0200
> > Pavel Machek <pavel@xxxxxx> 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@xxxxxxxxx>
> > > 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@xxxxxxxxx>
> > > 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
> > 
> > I tried to disable CONFIG_CPU_IDLE and CONFIG_CPU_FREQ, however for some reason I could only disable CONFIG_CPU_FREQ.
> > 
> > The bug persisted.
> > 
> > Reverting the commit 84c91b7 on top of e67ee10 fixes the problem.
> > 
> > I created a copy of the bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=96111
> 
> Please check if 4.0-rc6 still has the problem and if reverting the commit in
> question on top of it fixes the problem too.
> 
> 

I took the commit 8f778bbc542ddf8f6243b21d6aca087e709cabdc as the base for further checking (I started building before I read your message). It's a descendant of 4.0-rc6, so I hope it's not going to make a difference.

Results:
8f778bb : bad
8f778bb + reverted 84c91b7 : good
8f778bb + patch [1] : good

Thanks!

[1]:
x86: Kill E820_RESERVED_KERN  https://lkml.org/lkml/2015/3/4/434 as suggested in joeyli's other email.
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