Em Tue, 4 Dec 2007 17:00:05 +0100 Ingo Molnar <[EMAIL PROTECTED]> escreveu:
| | * Linus Torvalds <[EMAIL PROTECTED]> wrote: | | > | > | > On Tue, 4 Dec 2007, Luiz Fernando N. Capitulino wrote: | > > | > > sched_rr_get_interval(1, NULL); | > | > Looks like we have a zero "cfs_rq->load.weight". | > | > Ingo? Both sched_slice() and __sched_slice() do a divide by the | > runqueue weight, and at least dequeue_task_fair() explicitly checks | > for that being zero, so clearly zero is a possible value. Hmm? | | yeah, i can reproduce this crash too. | | The problem is on SMP: if sched_rr_get_interval() gets a task from an | otherwise idle runqueue, then rq->load.weight is 0. Normally | sched_slice() is only used on a busy runqueue. So the correct fixup site | is not in sched_slice() but in sys_sched_rr_get_interval() - i'm working | on the right fix, i hope to be able to send a pull request in a few | minutes. Ingo, I can reproduce this w/o SMP support as well. (Also, the backtrace I sent was reproduced on a UP machine with a SMP kernel). -- Luiz Fernando N. Capitulino -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
