r0 = epoll_create(0x6)
r1 = epoll_create(0x81)
r2 = epoll_create(0x1)
epoll_ctl$EPOLL_CTL_ADD(r2, 0x1, r1, &(0x7f0000000080))
epoll_ctl$EPOLL_CTL_ADD(r1, 0x1, r0, &(0x7f0000000180))
epoll_ctl$EPOLL_CTL_ADD(r0, 0x1, r2, &(0x7f0000000040))