From: Josh Triplett <josht@us.ibm.com>

rcu_torture_init kmallocs the array of reader threads, then creates each
one with kthread_run, cleaning up with rcu_torture_cleanup if this fails. 
rcu_torture_cleanup calls kthread_stop on any non-NULL pointer in the
array; however, any readers after the one that failed to start up will have
invalid pointers, not null pointers.  Avoid this by using kzalloc instead.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/rcutorture.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN kernel/rcutorture.c~rcu-avoid-kthread_stop-on-invalid-pointer-if-rcutorture kernel/rcutorture.c
--- a/kernel/rcutorture.c~rcu-avoid-kthread_stop-on-invalid-pointer-if-rcutorture
+++ a/kernel/rcutorture.c
@@ -780,7 +780,7 @@ rcu_torture_init(void)
 		writer_task = NULL;
 		goto unwind;
 	}
-	reader_tasks = kmalloc(nrealreaders * sizeof(reader_tasks[0]),
+	reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]),
 			       GFP_KERNEL);
 	if (reader_tasks == NULL) {
 		VERBOSE_PRINTK_ERRSTRING("out of memory");
_