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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@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-12-02 17:52:07 -08:00
parent 8a67a20bf2
commit edf7b84178
1 changed files with 5 additions and 0 deletions
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5
kernel/rcu/rcutorture.c
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@ -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();