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17 May 2024, 11:00:25 UTC
Revision 9c95e7319ba98585ebb6d304eca2d56f401ed70c authored by Hiroshi Shimamoto on 19 September 2007, 21:34:46 UTC, committed by Ingo Molnar on 19 September 2007, 21:34:46 UTC 
sched: fix invalid sched_class use
 
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.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
1 parent 1799e35
History
Tip revision: 9c95e7319ba98585ebb6d304eca2d56f401ed70c authored by Hiroshi Shimamoto on 19 September 2007, 21:34:46 UTC
sched: fix invalid sched_class use
Tip revision: 9c95e73
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