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    SubjectRe: Random panic in load_balance() with 3.16-rc
    On 23.07.2014 18:31, Michel Dänzer wrote:
    > On 23.07.2014 18:25, Peter Zijlstra wrote:
    >> On Wed, Jul 23, 2014 at 10:28:19AM +0200, Peter Zijlstra wrote:
    >>
    >>> Of course, the other thing that patch did is clear sgp->power (now
    >>> sgc->capacity).
    >>
    >> Hmm, re-reading the thread there isn't a clear confirmation its this
    >> patch at all. Could you perhaps bisect this to either verify it is
    >> indeed that patch we're talking about:
    >>
    >> caffcdd8d27b ("sched: Do not zero sg->cpumask and sg->sgp->power in build_sched_groups()")
    >>
    >> or find which patch is causing this.
    >
    > It can take a long time for the problem to occur, so I need to run at
    > least for one or two days to be at least somewhat sure a given kernel is
    > not affected.
    >
    > I'll try reproducing the problem with your previous suggestions first,

    Just happened again, with your robustness patch and setting
    sg->sgc->capacity = 0.

    > but if I manage to do that, I guess there's no alternative to bisecting...

    I hope the assembly output I sent earlier helps, I'm afraid bisecting
    this could be painful.


    --
    Earthling Michel Dänzer | http://www.amd.com
    Libre software enthusiast | Mesa and X developer
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