Re: [PATCH] mm: kmemleak: Ensure that the task stack is not freed during scanning

[Hillf Danton]

> @@ -1453,8 +1453,11 @@ static void kmemleak_scan(void)
> 
>  		read_lock(&tasklist_lock);
>  		do_each_thread(g, p) {

Take a look at this commit please.
	1da4db0cd5 ("oom_kill: change oom_kill.c to use for_each_thread()")

> -			scan_block(task_stack_page(p), task_stack_page(p) +
> -				   THREAD_SIZE, NULL);
> +			void *stack = try_get_task_stack(p);
> +			if (stack) {
> +				scan_block(stack, stack + THREAD_SIZE, NULL);
> +				put_task_stack(p);
> +			}
>  		} while_each_thread(g, p);
>  		read_unlock(&tasklist_lock);
>  	}
>