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    SubjectRe: v3.1-rc5: Weird kernel log message when resuming avout NMI received
    From
    Guys,

    Just to let you know that I'm still getting this warning with 3.1-rc5

    On Tue, Aug 16, 2011 at 5:07 PM, Francis Moreau <francis.moro@gmail.com> wrote:
    > Peter,
    >
    > On Mon, Aug 15, 2011 at 10:37 AM, Francis Moreau <francis.moro@gmail.com> wrote:
    >> Hello Peter,
    >>
    >> Sorry for the loooonnng delay but summer rest :)
    >>
    >> On Mon, Aug 1, 2011 at 1:05 PM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
    >>> On Sun, 2011-07-31 at 19:32 +0400, Cyrill Gorcunov wrote:
    >>>
    >>>> > >> I'm seeing those kernel message when resuming:
    >>>> > >>
    >>>> > >> [  524.973283] Uhhuh. NMI received for unknown reason 3d on CPU 0.
    >>>> > >> [  524.973288] Do you have a strange power saving mode enabled?
    >>>> > >> [  524.973289] Dazed and confused, but trying to continue
    >>>> > >>
    >>>> > >> I don't know if it's important or not because the system seems to work
    >>>> > >> after but maybe it worths to report
    >>>
    >>> So I guess the problem is the NMI watchdog and suspend stuff not
    >>> shutting things down properly..
    >>>
    >>> Argh, the PM notifier muck runs before the hotplug notifiers and it
    >>> doesn't avoid hotplug races on its own.. what crap.
    >>>
    >>> something like the below perhaps, compile tested only.. does it work?
    >>
    >> Thanks for the fix, I'm going to give it a test and report in 2 days.
    >>
    >
    > I'm trying to test the fix but have to stick with the 3.0 kernel and
    > your patch seems to be based on 3.1.
    >
    > So I had to backport a couple of patches otherwise I'm getting the
    > following error:
    >
    >  CC      kernel/events/core.o
    > kernel/events/core.c: In function ‘perf_pm_resume_cpu’:
    > kernel/events/core.c:7342: error: implicit declaration of function
    > ‘perf_ctx_lock’
    > kernel/events/core.c:7350: error: implicit declaration of function
    > ‘perf_ctx_unlock’
    > kernel/events/core.c: In function ‘perf_pm_suspend_cpu’:
    > kernel/events/core.c:7370: error: implicit declaration of function
    > ‘perf_event_sched_in’
    >
    > Here are the patches that I backported on top of 3.0:
    >
    >  perf: Collect the schedule-in rules in one function
    >  perf: Change and simplify ctx::is_active semantics
    >  perf: Simplify and fix __perf_install_in_context()
    >  perf: Remove task_ctx_sched_in()
    >  perf: Optimize event scheduling locking
    >  perf: Clean up 'ctx' reference counting
    >  perf: Optimize ctx_sched_out()
    >
    > After the second suspend/resume sequence I still have the same warning
    > except that the reason has changed to '2d':
    >
    >  kernel:[  404.091393] Uhhuh. NMI received for unknown reason 2d on CPU 0.
    >  kernel:[  404.091394] Do you have a strange power saving mode enabled?
    >  kernel:[  404.091396] Dazed and confused, but trying to continue
    >


    --
    Francis
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