Commit edf7b841 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 8a67a20b

kernel/rcu/rcutorture.c

+5 −0
Original line number Diff line number Diff line
@@ -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();