* Hiroshi Shimamoto <[email protected]> wrote:
> Hi Ingo,
>
> I found an issue about the scheduler.
> If you need a test case, please let me know.
> Here is a patch.
>
> When using rt_mutex, a NULL pointer dereference is occurred at
> enqueue_task_rt. Here is a scenario;
> 1) there are two threads, the thread A is fair_sched_class and
> thread B is rt_sched_class.
> 2) Thread A is boosted up to rt_sched_class, because the thread A
> has a rt_mutex lock and the thread B is waiting the lock.
> 3) At this time, when thread A create a new thread C, the thread
> C has a rt_sched_class.
> 4) When doing wake_up_new_task() for the thread C, the priority
> of the thread C is out of the RT priority range, because the
> normal priority of thread A is not the RT priority. It makes
> data corruption by overflowing the rt_prio_array.
> The new thread C should be fair_sched_class.
>
> The new thread should be valid scheduler class before queuing.
> This patch fixes to set the suitable scheduler class.
Nice fix! It's a 2.6.23 must-have fix - i'll push it out into the
scheduler tree. Thanks!
Ingo
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