linux-kernel - Re: [PATCH] rcu: kasan: record and print kvfree_call

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Date:   Thu, 19 Nov 2020 13:49:34 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     qiang.zhang@...driver.com
Cc:     josh@...htriplett.org, rostedt@...dmis.org, joel@...lfernandes.org,
        rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, urezki@...il.com
Subject: Re: [PATCH] rcu: kasan: record and print kvfree_call_rcu call stack

On Wed, Nov 18, 2020 at 11:53:09AM +0800, qiang.zhang@...driver.com wrote:
> From: Zqiang <qiang.zhang@...driver.com>
> 
> Add kasan_record_aux_stack function for kvfree_call_rcu function to
> record call stacks.
> 
> Signed-off-by: Zqiang <qiang.zhang@...driver.com>

Thank you, but this does not apply on the "dev" branch of the -rcu tree.
See file:///home/git/kernel.org/rcutodo.html for more info.

Adding others on CC who might have feedback on the general approach.

							Thanx, Paul

> ---
>  kernel/rcu/tree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index da3414522285..a252b2f0208d 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -3506,7 +3506,7 @@ void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
>  		success = true;
>  		goto unlock_return;
>  	}
> -
> +	kasan_record_aux_stack(ptr);
>  	success = kvfree_call_rcu_add_ptr_to_bulk(krcp, ptr);
>  	if (!success) {
>  		run_page_cache_worker(krcp);
> -- 
> 2.17.1
>