> @@ -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);
>       }
> 

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