r0 = epoll_create1(0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000480)={0xffffffffffffffff, <r1=>0xffffffffffffffff})
epoll_ctl$EPOLL_CTL_ADD(r0, 0x1, r1, &(0x7f00000004c0))