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Date: Wed, 19 Sep 2007 23:37:15 +0200 From: Ingo Molnar <mingo@...e.hu> To: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com> Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH] sched: fix to use invalid sched_class * Hiroshi Shimamoto <h-shimamoto@...jp.nec.com> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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