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From: Paul E. McKenney on 22 Apr 2010 16:00
A given task's cgroups structures must remain while that task is running
due to reference counting, so this is presumably a false positive.
Updated to reflect feedback from Tetsuo Handa.

Signed-off-by: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com>
---
kernel/sched.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 14c44ec..f425a2b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4575,9 +4575,13 @@ recheck:
* Do not allow realtime tasks into groups that have no runtime
* assigned.
*/
+ rcu_read_lock();
if (rt_bandwidth_enabled() && rt_policy(policy) &&
- task_group(p)->rt_bandwidth.rt_runtime == 0)
+ task_group(p)->rt_bandwidth.rt_runtime == 0) {
+ rcu_read_unlock();
return -EPERM;
+ }
+ rcu_read_unlock();
#endif

retval = security_task_setscheduler(p, policy, param);
--
1.7.0

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Next: [075/197] thinkpad-acpi: lock down video output state access