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    SubjectRe: frequent lockups in 3.18rc4
    On Fri, Dec 26, 2014 at 07:14:55PM -0800, Linus Torvalds wrote:
    > On Fri, Dec 26, 2014 at 4:36 PM, Dave Jones <davej@codemonkey.org.uk> wrote:
    > > >
    > > > Oh - and have you actually seen the "TSC unstable (delta = xyz)" +
    > > > "switched to hpet" messages there yet?
    > >
    > > not yet. 3 hrs in.
    >
    > Ok, so then the
    >
    > INFO: rcu_preempt detected stalls on CPUs/tasks:
    >
    > has nothing to do with HPET, since you'd still be running with the TSC enabled.

    right. 16hrs later, that's the only thing that's spewed.

    > My googling around did find a number of "machine locks up a few hours
    > after switching to hpet" reports, so it is possible that the whole rcu
    > stall and nmi watchdog thing is independent and unrelated to the
    > actual locking up.

    possible. I'm heading home in a few hours to start the wipe of that
    box. This is going to be 'the one that got away', but at least we've
    managed to find a number of other things that needed fixing along the way.

    Dave


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