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@xxxxxxxxxx>
---
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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