Re: BUG on 2.6.24.3-rt3.

[Gilles Carry <Gilles.Carry@bull.net>]

Hi,

I had this bug also when testing ltp's hrtimer-prio.c.
So far I could not reproduce it but still I applied your patch.
I'll let you know if I find something useful.

Gilles.



Steven Rostedt wrote:

>Sripathi,
>
>Thanks for reporting this.
>
>On Tue, 4 Mar 2008, Sripathi Kodi wrote:
>  
>
>>I can recreate the problem easily and can also get a kdump. Please let
>>me know if any other information will help in analyzing this.
>>    
>>
>
>Could you try this patch and let me know if it fixes your problem.
>
>-- Steve
>
>Signed-off-by: Steven Rostedt <srostedt@redhat.com>
>
>---
> kernel/sched_rt.c |    6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
>Index: linux-2.6.24.3-rt3/kernel/sched_rt.c
>===================================================================
>--- linux-2.6.24.3-rt3.orig/kernel/sched_rt.c	2008-03-04 13:49:53.000000000 -0500
>+++ linux-2.6.24.3-rt3/kernel/sched_rt.c	2008-03-04 13:51:27.000000000 -0500
>@@ -840,9 +840,11 @@ static void prio_changed_rt(struct rq *r
> 			pull_rt_task(rq);
> 		/*
> 		 * If there's a higher priority task waiting to run
>-		 * then reschedule.
>+		 * then reschedule. Note, the above pull_rt_task
>+		 * can release the rq lock and p could migrate.
>+		 * Only reschedule if p is still on the same runqueue.
> 		 */
>-		if (p->prio > rq->rt.highest_prio)
>+		if (p->prio > rq->rt.highest_prio && task_rq(p) == rq)
> 			resched_task(p);
> #else
> 		/* For UP simply resched on drop of prio */
>--
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>
>  
>

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