On Fri, Apr 15, 2016 at 10:19:12AM +0800, Xunlei Pang wrote: > On 2016/04/15 at 09:58, Xunlei Pang wrote: > > On 2016/04/14 at 23:31, Peter Zijlstra wrote: > >> On Thu, Apr 14, 2016 at 07:37:06PM +0800, Xunlei Pang wrote: > >>> We access @pi_task's data without any lock in enqueue_task_dl(), though > >>> checked "dl_prio(pi_task->normal_prio)" condition, that's not enough. > >> The proper fix is to ensure that pi_task is guaranteed to be blocked. > > Even if pi_task was blocked, its parameters are still allowed to be changed, > > so we have to do that. Did I miss something? > > > > Regards, > > Xunlei > > Fortunately, I just reproduced through an overnight test, so it really > happened in reality as I thought.
But what happens? How is it changed when it is blocked?
