linux-kernel - Re: Bisected: s2disk (uswsusp only) hangs just before poweroff

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Date:	Tue, 01 Dec 2009 12:24:33 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
CC:	pm list <linux-pm@...ts.linux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: Bisected: s2disk (uswsusp only) hangs just before poweroff

On 12/01/09 11:59, Alan Jenkins wrote:
> Hi
>
> Suspend to disk is (sometimes) hanging for me in 2.6.32-rc. I finally
> got around to bisecting it, which blamed the following commit by Mel:
>
> 5f8dcc2 "page-allocator: split per-cpu list into one-list-per-migrate-type"
>
> I was able to confirm this by reverting the commit, which fixed the
> hang. I had to revert one other commit first to avoid a conflict:
>
> a6f9edd "page-allocator: maintain rolling count of pages to free from
> the PCP"
>
> -- detail --
>
> When I suspend my EeePc 701 to disk, it sometimes hangs after writing
> out the hibernation image. The system is still able to resume from this
> image (after working around the hang by pressing the power button).
> This is specific to s2disk from the uswsusp package (which is now
> installed by default on debian unstable). It doesn't happen if I
> uninstall uswsusp and use the in-kernel suspend instead.
>
> The hang doesn't happen if I boot with "init=/bin/bash" and run s2disk.
> Nor does it happen if I boot normally, then switch to single user mode
> ("telinit 12").
>
> It only happens if I've logged in to KDE. In the past, this has
> indicated a problem in a network driver, since NetworkManager only made
> a connection once I logged in. But it still hangs if I remove both ath5k
> and atl2 before I log into KDE. (I actually tried removing as many
> modules as possible: atl2, ath5k, usbcore, snd-hda-intel, psmouse,
> pcspkr, battery, ac, themal, fan, and eeepc-laptop). Perhaps it's
> something to do with the size of the hibernation image.
>
> -- confidence in the bisection result --
>
> The randomness was a bit annoying, but it's not too bad. The hang would
> normally show up in the first 3 hibernation cycles; I don't remember
> having to wait more than 6.
>
> I wrote a script to do s2disk + rtcwake so I could leave it testing
> without constantly hitting the power button. This let me test 2.6.32-rc8
> with the reverts for at least 20 hibernation cycles.
>
> Regards
> Alan
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>

hmm.. maybe this is what I'm seeing over here
i.g. on my macbook(ati gpu) the first s2ram will
lagg for about 30/40 secs before waking up
then every other cycle afterwards reacts as it should.
Threw in kernels 2.6.30,31 before doing anything
but showed the same results, leading me to beleive maybe
I have some userspace issue(libx86)going on.

I'll try reverting that commit to see.

Thanks

Justin P. Mattock
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