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    SubjectRe: v3.0: Weird kernel log message when resuming avout NMI received
    From
    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

    Thanks
    --
    Francis
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