On 11.07.2016 10:25, Wanpeng Li wrote:
2016-06-16 20:57 GMT+08:00 Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>:
Hierarchy could be already throttled at this point. Throttled next
buddy could trigger null pointer dereference in pick_next_task_fair().
There is cfs_rq->next check in pick_next_entity(), so how can null
pointer dereference happen?
If we nominate task from throttled hiearchy as a next buddy then at some
level in pick_next_task_fair we could pick cfs_rq which has no runnable
entities - in pick_next_entiry both "curr" and "left" are NULL.
--
Konstantin
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