This is a note to let you know that I've just added the patch titled
sched: Fix update_curr_rt()
to the 2.6.37-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-fix-update_curr_rt.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 06c3bc655697b19521901f9254eb0bbb2c67e7e8 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <[email protected]>
Date: Wed, 2 Feb 2011 13:19:48 +0100
Subject: sched: Fix update_curr_rt()
From: Peter Zijlstra <[email protected]>
commit 06c3bc655697b19521901f9254eb0bbb2c67e7e8 upstream.
cpu_stopper_thread()
migration_cpu_stop()
__migrate_task()
deactivate_task()
dequeue_task()
dequeue_task_rq()
update_curr_rt()
Will call update_curr_rt() on rq->curr, which at that time is
rq->stop. The problem is that rq->stop.prio matches an RT prio and
thus falsely assumes its a rt_sched_class task.
Reported-Debuged-Tested-Acked-by: Thomas Gleixner <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/sched_rt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -606,7 +606,7 @@ static void update_curr_rt(struct rq *rq
struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
u64 delta_exec;
- if (!task_has_rt_policy(curr))
+ if (curr->sched_class != &rt_sched_class)
return;
delta_exec = rq->clock_task - curr->se.exec_start;
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.37/sched-fix-update_curr_rt.patch
queue-2.6.37/sched-change-wait_for_completion_-_timeout-to-return-a-signed-long.patch
queue-2.6.37/sched-cgroup-use-exit-hook-to-avoid-use-after-free-crash.patch
_______________________________________________
stable mailing list
[email protected]
http://linux.kernel.org/mailman/listinfo/stable
