linux-kernel - Re: Linux 3.7-rc3

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Message-ID: <alpine.LRH.2.00.1210301048390.10392@twin.jikos.cz>
Date:	Tue, 30 Oct 2012 10:50:50 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	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 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.
> 
> 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).

-- 
Jiri Kosina
SUSE Labs

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