linux-kernel - Re: Linux 3.7-rc3

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Date:	Tue, 30 Oct 2012 13:53:05 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Linux 3.7-rc3

On Tue 30-10-12 10:50:50, Jiri Kosina wrote:
> On Tue, 30 Oct 2012, Rafael J. Wysocki wrote:
> 
> > > Nothing particularly stands out here. Lots of small fixes, exemplified
> > > by the series of memory leak fixes in usb serial drivers. Just a lot
> > > of random stuff..
> > > 
> > > Most of it is drivers (all over: drm, wireless, staging, usb, sound),
> > > but there's a few filesystem updates (nfs, btrfs, ext4), arch updates
> > > (arm, x86 and m68k) and just random stuff. Shortlog appended.
> > 
> > Unfortunately, s2disk is broken with this one and previous -rc.  In the
> > majority of cases it just hangs the machine during hibernation, although
> > sometimes it returns to user space reporting freezing problems, suspicions
> > RCU usage and similar stuff, pretty much without any useful debug information.

Which RCU config options you have enabled?

> > I'm quite confident that v3.6 was OK (and -stable based on that too), so
> > it most likely is a recent regression.  The in-kernel hibernation
> > (ie. "echo disk > /sys/power/state") works no problem.  So does suspend to
> > RAM on my test boxes.
> > 
> > So far I have been able to reproduce this 100% of the time on two machines
> > with Intel CPUs and graphics driven by i915.  I _suspect_ that this may be
> > related to VT switching, because s2disk does some ugly things in that area
> > which are not done by the in-kernel code.  Dunno.
> > 
> > Anyway, it looks like nothing short of bisection is going to help debug this,
> > but I'm afraid I won't have the time to bisect within the next two weeks, so if
> > anyone can reproduce this issue and will be able to bisect it, please help
> > (openSUSE/Tumbleweed users anyone?).
> 
> Just a data point here -- this is probably not generally true.
> 
> I am using s2disk very often on my x200s, and I haven't hit this problem 
> so far (currently running 2ab3f29, i.e. slightly before rc3).

No problem for me either. Runnning rc3. See the config attached.
-- 
Michal Hocko
SUSE Labs

View attachment "config-3.7.0-rc3" of type "text/plain" (76569 bytes)