From: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Date: Thu, 11 Sep 2025 03:18:11 +0000 (+0530)
Subject: refperf: Set reader_tasks to NULL after kfree()
X-Git-Tag: v6.18-rc1~86^2^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1441edd129e36cf5d1a9c2abff39619d5d90e1a8;p=thirdparty%2Fkernel%2Fstable.git

refperf: Set reader_tasks to NULL after kfree()

Set reader_tasks to NULL after kfree() in ref_scale_cleanup() to
improve debugging experience with kernel debugging tools. This
follows the common pattern of NULLing pointers after freeing to
avoid dangling pointer issues during debugging sessions.

Setting pointers to NULL after freeing helps debugging tools like
kdgb,drgn, and other kernel debuggers by providing clear indication
that the memory has been freed and the pointer is no longer valid.

Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 7f3d23762ef7c..19841704d8f57 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -1133,6 +1133,7 @@ ref_scale_cleanup(void)
 					     reader_tasks[i].task);
 	}
 	kfree(reader_tasks);
+	reader_tasks = NULL;
 
 	torture_stop_kthread("main_task", main_task);