Hi
This version makes sense to me. and I verified this change don't break
procps tools.
But,
> +int vm_is_stack(struct task_struct *task,
> + struct vm_area_struct *vma, int in_group)
> +{
> + if (vm_is_stack_for_task(task, vma))
> + return 1;
> +
> + if (in_group) {
> + struct task_struct *t = task;
> + while_each_thread(task, t) {
How protect this loop from task exiting? AFAIK, while_each_thread
require rcu_read_lock or task_list_lock.
> + if (vm_is_stack_for_task(t, vma))
> + return 1;
> + }
> + }
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