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    SubjectRe: PPro arch_cpu_idle: NMI watchdog: Watchdog detected hard LOCKUP on cpu 1
    > On Thu, 2 Mar 2017, Thomas Gleixner wrote:
    > > On Wed, 1 Mar 2017, Thomas Gleixner wrote:
    > > > On Thu, 2 Mar 2017, Meelis Roos wrote:
    > > >
    > > > > > > This is on my trusty IBM PC365, dual Pentium Pro. 4.10 worked fine,
    > > > > > > 4.10.0-09686-g9e314890292c and 4.10.0-10770-g2d6be4abf514 exhibit a
    > > > > > > problem. Ocassionally NMI watchdog kicks in and discovers one of the
    > > > > > > CPUs in LOCKUP. The system keeps running fine. The first lockup was
    > > > > > > different, all the others were from arch_cpu_idle. Sometime ecey couple
    > > > > > > of seconds (after some activity), sometimes nothing for a long time
    > > > > > > (idle, no SSH logins).
    > > > > >
    > > > > > The only watchdog related patch which hit after 4.10 is:
    > > > > >
    > > > > > 8dcde9def5a1 kernel/watchdog.c: do not hardcode CPU 0 as the initial thread
    > > > > >
    > > > > > Can you try to revert that for a start? I'm not seeing why it should be the
    > > > > > culprit from a quick glance, but ...
    > > > >
    > > > > Reverting this patch does not help.
    > > >
    > > > I did not expect that, but excluding it was a valid shot in the
    > > > dark. Thanmks for trying.
    > > >
    > > > To be honest, I have no idea what causes that at the moment, but I will
    > > > come back to you tomorrow after thinking it through (with brain awake) how
    > > > to debug this.
    > >
    > > Went through the related changes which came in during the merge window. One
    > > which affects the per cpu timers is: 914122c389d0
    > >
    > > Can you try to revert that one please?
    >
    > Running out of obvious culprits. Any chance that you can do a bisect or
    > this too painful on that box?

    I started bisect yesterday on the P4 that has one similar occurrance.

    --
    Meelis Roos (mroos@linux.ee)

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