Messages in this thread | | | Date | Wed, 19 Feb 2014 11:12:11 +0800 | From | Michael wang <> | Subject | Re: [BUG] sched: tip/master show panic while booting/rebooting |
| |
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 ;-)
Regards, Michael Wang
> -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
| |