So I was just looking things over quickly, and something jumped out at
me.  In ep_control():

> +     } else if (!(*io) && epi) {
> +             /* delete this eventpoll entry */
> +             if (is_file_epoll(target)) {
> +                     tep = target->private_data;
> +                     mutex_lock_nested(&tep->mtx, 1);
> +             }
> +             if (is_file_epoll(target))
> +                     mutex_lock_nested(&tep->mtx, 1);

How could that possibly work?  I can't imagine tep->mtx is going to
react well to being locked a second time...

jon
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