In core.sys.linux.epoll, struct epoll_event is defined as 

struct epoll_event 
{
align(1):
    uint events;
    epoll_data_t data;
}

where it should be

align(1) struct epoll_event 
{
align(1):
    uint events;
    epoll_data_t data;
}

This causes epoll_event.sizeof == 16, where it should be 12, thus an array of epoll_event is meaningless.