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    SubjectRe: Soft lockup during suspend since ~2.6.36 [bisected]
    Hello,

    On Fri, Apr 29, 2011 at 01:56:46AM +0200, Thilo-Alexander Ginkel wrote:
    > On Thu, Apr 28, 2011 at 12:30, Tejun Heo <tj@kernel.org> wrote:
    > > Does your kernel have preemption enabled?
    >
    > CONFIG_PREEMPT is not set
    >
    > > If not, does the following patch fix the problem?
    >
    > Yep, looks good so far (at least in my virtualized test environment):
    > 2.6.39-rc4 with your patch applied survived 100 suspend/resume cycles
    > w/o locking up.

    Awesome, I'll forward the patch to mainline and -stable.

    > Just out of curiosity: Was this a new issue in 2.6.39-rc4 ord could
    > this fix be backported to 2.6.38?

    This needs to be backported. It's an issue which has been there from
    the initial implementation of cmwq. It needs non-preemptive kernel
    and rescuer kicking in at a very bad timing, so not many people seem
    to have been affected by this. Your setup somehow triggers it
    reliably.

    Thank you.

    --
    tejun


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