From: Paul E. McKenney on
The RCU read-side critical section needs to cover all uses of the pointer
returned by task_group().

Located-by: Li Zefan <lizf(a)cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com>
---
kernel/sched_fair.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index ca56133..a878b53 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1250,7 +1250,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
}

tg = task_group(p);
- rcu_read_unlock();
weight = p->se.load.weight;

/*
@@ -1277,6 +1276,7 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
balanced = this_eff_load <= prev_eff_load;
} else
balanced = true;
+ rcu_read_unlock();

/*
* If the currently running task will sleep within
--
1.7.0.6

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