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 <paul...@kernel.org>
AuthorDate: Wed, 02 Dec 2020 17:52:07 -08:00
Committer: Paul E. McKenney <paul...@kernel.org>
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 <paul...@kernel.org>
---
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();
