linux-kernel - Re: Linux 3.7-rc3

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Date:	Tue, 30 Oct 2012 11:10:34 +0100
From:	"Arend van Spriel" <arend@...adcom.com>
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>,
	"Hante Meuleman" <meuleman@...adcom.com>
Subject: Re: Linux 3.7-rc3

On 10/30/2012 01:10 AM, Rafael J. Wysocki wrote:
> On Sunday, October 28, 2012 12:59:49 PM Linus Torvalds wrote:
>> It's been a week, time for -rc3!
>>
>> 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.

Since v3.7-rc1 I am seeing suspend to RAM fail as well. It was obscured 
by a nouveau recursive locking issue on my machine. I reverted the 3.7 
DRM merged completely. From there "echo mem > /sys/power/state" works, 
but choosing suspend like most mere mortals do results in suspend, but 
attempt to resume brings me straight to the BIOS starting anew.

> 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?).
>
> Thanks,
> Rafael
>
>

Not sure if it has the same root cause. Since DRM revert did not work 
for me I put my money on ACPI (not a lot of money though ;-) ).

Gr. AvS

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