On Tue, Jan 03, 2012 at 02:13:01PM -0800, Tejun Heo wrote: > > That's pretty odd. Given Hughs report as well, it sure does sound like > > we now have some life time issues with cfqq's. > > Hmmm... I disabled cfqq merge logic (commented out > cfq_close_cooperator() and the following cfq_setup_merge() calls) in > cfq_select_queue() and neither is triggering for quite a while now. > Maybe cfqq refcnt is getting borked over cfqq merging / splitting? It > would also explain the low frequency of the issue too. I'll try to > further isolate it but It would be awesome if someone more familiar > with the logic can go over that part. Scrap that. It triggered and yeah cfq_get_next_queue() is retrieving empty cfqq from the service tree. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
