[tip: core/rcu] rcutorture: Make object_debug also double call_rcu() heap object

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     edf7b8417834c89d00ef88355ea507b0b0a630ae
Gitweb:        https://git.kernel.org/tip/edf7b8417834c89d00ef88355ea507b0b0a630ae
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Wed, 02 Dec 2020 17:52:07 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Wed, 06 Jan 2021 17:17:21 -08:00

rcutorture: Make object_debug also double call_rcu() heap object

This commit provides a test for call_rcu() printing the allocation address
of a double-freed callback by double-freeing a callback allocated via
kmalloc().  However, this commit does not depend on any other commit.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 kernel/rcu/rcutorture.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 007595d..76c8386 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2782,6 +2782,7 @@ static void rcu_test_debug_objects(void)
 #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
 	struct rcu_head rh1;
 	struct rcu_head rh2;
+	struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
 
 	init_rcu_head_on_stack(&rh1);
 	init_rcu_head_on_stack(&rh2);
@@ -2794,6 +2795,10 @@ static void rcu_test_debug_objects(void)
 	local_irq_disable(); /* Make it harder to start a new grace period. */
 	call_rcu(&rh2, rcu_torture_leak_cb);
 	call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */
+	if (rhp) {
+		call_rcu(rhp, rcu_torture_leak_cb);
+		call_rcu(rhp, rcu_torture_err_cb); /* Another duplicate callback. */
+	}
 	local_irq_enable();
 	rcu_read_unlock();
 	preempt_enable();