rcutorture: Add missing destroy_timer_on_stack()

The rcu_torture_reader() function uses an on-stack timer_list structure
which it initializes with setup_timer_on_stack().  However, it fails to
use destroy_timer_on_stack() before exiting, which results in leaking a
tracking object if DEBUG_OBJECTS is enabled.  This commit therefore
invokes destroy_timer_on_stack() to avoid this leakage.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 8b2748486c17..a7d18069a96d 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1023,8 +1023,10 @@ rcu_torture_reader(void *arg)
                 cond_resched();
                 stutter_wait("rcu_torture_reader");
         } while (!torture_must_stop());
-        if (irqreader && cur_ops->irq_capable)
+        if (irqreader && cur_ops->irq_capable) {
                 del_timer_sync(&t);
+                destroy_timer_on_stack(&t);
+        }
         torture_kthread_stopping("rcu_torture_reader");
         return 0;
 }