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    SubjectRe: Bisected: s2disk (uswsusp only) hangs just before poweroff
    Justin P. Mattock wrote:
    > 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

    I don't expect so. My problem doesn't affect s2ram. And as far as I
    can tell, my hang is forever... it's more than just 40 seconds.


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