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SubjectRe: [BUG] sched: tip/master show panic while booting/rebooting
On Wed, Feb 19, 2014 at 11:12:11AM +0800, Michael wang wrote:
> On 02/18/2014 07:22 PM, Peter Zijlstra wrote:
> > On Tue, Feb 18, 2014 at 01:12:03PM +0800, Michael wang wrote:
> >> Hi, Folks
> >>
> >> Got below panic while testing tip/master on x86 box, it randomly
> >> occur while booting or rebooting, any ideas?
> >
> > The obvious pick would be the relocation of the idle_balance call, but
> > I'm not sure how that'll end up stalling.
>
> I've review the code again, seems like it was caused by the same issue
> we discussed (RT/DL enqueued issue), I found that idle_balance() will
> return 1 in such cases:
>
> /*
> * While browsing the domains, we released the rq lock.
> * A task could have be enqueued in the meantime
> */
> if (this_rq->nr_running && !pulled_task)
> return 1;
>
> And if no more fair task to be pulled, we will do balance again and
> again in pick_next_task_fair() until panic in NMI...
>
> The solution we discussed could solve the problem I suppose, it was
> already in progress, correct?
>
> Please let me know if there are any thing I could help with ;-)

Great, thanks!

Right, I'm waiting for Ingo to appear and commit some patches into tip.


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