socketpair$nbd(0x1, 0x1, 0x0, 0x0)
r0 = epoll_create1(0x0)
r1 = epoll_create(0x3ff)
epoll_ctl$EPOLL_CTL_ADD(r1, 0x1, r0, &(0x7f0000000200)={0x20000001})